#chemistry

Atomare Isotopen-Referenzdaten als API, basierend auf den NIST Atomic Weights and Isotopic Compositions. Für jedes bekannte Nuklid: sein Element (Ordnungszahl Z und Symbol), Massenzahl, relative Atommasse, natürliche Isotopenzusammensetzung (Häufigkeit) und die Standard-Atommasse des Elements. Suchen Sie ein Isotop nach Bezeichnung (C-12, U-238) oder nach Symbol + Masse, listen Sie alle Isotope eines Elements auf, ordnen Sie Isotope nach Masse oder natürlicher Häufigkeit oder suchen Sie. Eine präzise physikalische und chemische Referenz für Wissenschaft, Bildung, Labor- und Ingenieuranwendungen. Unterscheidet sich von elementaren Daten.

api.oanor.com/isotopes-api

Faraday-law electrolysis maths as an API, computed locally and deterministically. The mass endpoint applies Faraday's first law of electrolysis, m = (Q·M)/(n·F) = (I·t·M)/(n·F), to give the mass of a substance deposited at a cathode or dissolved at an anode from the charge passed — or the current and time — the molar mass and the valence (electrons transferred per ion), with the Faraday constant 96485 C/mol. The charge endpoint inverts it to give the charge Q = (m·n·F)/M and, with a current, the plating time needed to deposit a target mass — the core sizing calculation for electroplating and anodising. The gas-volume endpoint computes the volume of gas evolved during electrolysis, moles = Q/(n·F) and volume = moles × 22.414 L/mol at STP, using the electrons per gas molecule (two for hydrogen, four for oxygen in water electrolysis). Molar mass is in g/mol, current in amperes, time in seconds, charge in coulombs and mass in grams. Everything is computed locally and deterministically, so it is instant and private. Ideal for electroplating, anodising, battery, hydrogen-production and chemistry-education app developers, plating-time and gas-yield tools, and electrochemistry teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is electrolysis (Faraday's laws); for cell potential and the Nernst equation use an electrochemistry Nernst API.

api.oanor.com/electrolysis-api

Colligative-properties chemistry maths as an API, computed locally and deterministically. The freezing-point endpoint computes the freezing-point depression ΔTf = i·Kf·m and the resulting lowered freezing point of a solution, from the molality, the cryoscopic constant (1.86 °C·kg/mol for water) and the van 't Hoff factor i — which is 1 for a non-electrolyte like sugar, about 2 for sodium chloride and about 3 for calcium chloride. The boiling-point endpoint computes the boiling-point elevation ΔTb = i·Kb·m and the raised boiling point, with the ebullioscopic constant (0.512 °C·kg/mol for water). The osmotic-pressure endpoint computes the van 't Hoff osmotic pressure Π = i·M·R·T from the molarity, the temperature and the van 't Hoff factor, the pressure that drives osmosis across a semipermeable membrane, returned in atmospheres, kilopascals and bar. Molality is in mol per kg of solvent, molarity in mol per litre of solution and temperature in kelvin. Everything is computed locally and deterministically, so it is instant and private. Ideal for chemistry-education, food-science, antifreeze, desalination and biology app developers, solution and de-icing tools, and STEM teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is colligative properties of solutions; for a compound's molar mass use a molar-mass API and for dilution concentrations a dilution API.

api.oanor.com/colligative-api

Matemáticas de estequiometría de reacciones químicas como API, calculadas local y determinísticamente. El endpoint de reactivo limitante toma dos reactivos con sus cantidades en moles y sus coeficientes de ecuación balanceada y determina cuál se agota primero — el reactivo limitante — comparando la relación moles/coeficiente (el avance de la reacción), y devuelve cuánto del reactivo en exceso sobra. El endpoint de rendimiento calcula el rendimiento teórico de un producto, en moles y gramos, a partir del reactivo limitante y el coeficiente estequiométrico y la masa molar del producto, n_producto = n_limitante·(coef_producto/coef_limitante), y — dado el rendimiento real — el rendimiento porcentual. El endpoint de mol-masa convierte entre moles, masa y número de partículas para una masa molar dada, usando moles = masa / masa_molar y N = moles · número de Avogadro (6.02214076e23). Las cantidades están en moles, las masas en gramos y las masas molares en g/mol. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para desarrolladores de aplicaciones de educación química, laboratorio, farmacéuticas e ingeniería química, herramientas de planificación de reacciones y rendimiento, y enseñanza STEM. Cálculo local puro — sin clave, sin servicio de terceros, instantáneo. En vivo, nada almacenado. 3 endpoints. Esto es estequiometría de reacciones; para la masa molar de un compuesto a partir de su fórmula use una API de masa molar y para concentraciones de soluciones una API de dilución.

api.oanor.com/stoichiometry-api

Electrochemistry maths as an API, computed locally and deterministically. The nernst endpoint applies the Nernst equation, E = E° − (R·T/nF)·ln Q, to give the actual electrode or cell potential under non-standard conditions from the standard potential E°, the number of electrons transferred n, the reaction quotient Q and the temperature — at 25 °C this reduces to E = E° − (0.05916/n)·log10 Q, and a larger Q (more product) lowers the potential. The cell-potential endpoint computes a galvanic cell's standard EMF from the cathode and anode standard reduction potentials, E°cell = E°cathode − E°anode, together with the standard Gibbs free energy ΔG° = −nF·E°cell and whether the reaction is spontaneous. The equilibrium endpoint computes the equilibrium constant of a redox reaction, K = exp(nF·E°cell / RT), and the corresponding ΔG°, from the standard cell potential and the electrons transferred. Potentials are in volts, energies in kJ/mol, the Faraday constant is 96485 C/mol and the gas constant 8.314 J/mol·K. Everything is computed locally and deterministically, so it is instant and private. Ideal for chemistry-education, battery, corrosion, electroplating and electroanalytical app developers, galvanic-cell and redox tools, and STEM teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is electrochemistry; for acid-base pH use a pH API and for reaction-rate kinetics an Arrhenius API.

api.oanor.com/nernst-api

Gas-mixture maths as an API, computed locally and deterministically. The partial-pressure endpoint applies Dalton's law — give a list of component partial pressures and it sums them to the total and returns each gas's mole fraction; or give a total pressure and a mole fraction to get a partial pressure; or component and total moles to get a mole fraction (and a partial pressure when a total pressure is supplied). The mole-fraction endpoint takes the moles of each component and returns every mole fraction and, with a total pressure, the partial pressures; supply the molar masses too and it adds the mass fractions and the average molar mass of the mixture. The effusion endpoint applies Graham's law, rate₁/rate₂ = √(M₂/M₁), to compare how fast two gases effuse or diffuse from their molar masses, naming the faster gas and the time ratio. Everything is computed locally and deterministically, so it is instant and private. Ideal for chemistry-education, laboratory, process and scuba app developers, gas-blending and stoichiometry tools, and STEM teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is gas-mixture maths; for the ideal-gas law of a single gas use a gas-law API and for molar mass from a formula a molar-mass API.

api.oanor.com/gasmixture-api

Molar-mass and stoichiometry maths as an API, computed locally and deterministically. The molarmass endpoint parses any chemical formula — with parentheses, square brackets and hydrate dots, such as Ca(OH)2, [Fe(CN)6]3 or CuSO4·5H2O — against the IUPAC conventional atomic weights and returns the molar mass in grams per mole, the total atom count and the per-element breakdown with each element's mass contribution and mass percent. The convert endpoint moves between moles, mass in grams and number of molecules for a formula, using n = mass ÷ M = molecules ÷ Nₐ with Avogadro's number. The percent endpoint gives the percent composition by mass and, for a given sample mass, the mass of each element it contains. The formula is parsed locally, so it works for any valid formula, not just compounds in a database, and is instant and private. Ideal for chemistry-education, laboratory, pharmaceutical and science app developers, stoichiometry and lab-prep tools, and STEM teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This computes molar mass from a formula; for compound database lookup use a chemistry API and for element properties an elements API.

api.oanor.com/molarmass-api

Matemática de propriedades coligativas para soluções como uma API, computada local e deterministicamente. O endpoint osmótico calcula a pressão osmótica pela equação de van 't Hoff, π = i·M·R·T, a partir da molaridade, temperatura e fator de van 't Hoff (número de partículas dissolvidas por unidade de fórmula — 1 para açúcar, 2 para NaCl, 3 para CaCl₂), reportada em atmosferas, bar e quilopascals, e também resolve a molaridade a partir de uma pressão medida. O endpoint de congelamento calcula o abaixamento do ponto de congelamento, ΔTf = i·Kf·m, a partir da molalidade e da constante crioscópica (1,86 °C·kg/mol para água), e o novo ponto de congelamento. O endpoint de ebulição calcula a elevação do ponto de ebulição, ΔTb = i·Kb·m, a partir da constante ebulioscópica (0,512 °C·kg/mol para água), e o novo ponto de ebulição. Tudo é computado local e deterministicamente, portanto é instantâneo e privado. Ideal para ferramentas de química, biologia e ciência de alimentos, estimativas de osmose reversa e dessalinização, formulação de anticongelantes e degelo, aplicações de laboratório e educação. Computação puramente local — sem chave, sem serviço de terceiros, instantâneo. Ao vivo, nada armazenado. 3 endpoints. Isto é química de propriedades coligativas; para diluição de soluções use uma API de diluição e para pH e tampões use uma API de pH.

api.oanor.com/osmosis-api

pH和酸碱数学作为API，本地确定性地计算。ph端点可以在描述酸度的四种方式之间自由转换——pH、pOH、水合氢离子浓度[H+]和氢氧根浓度[OH−]：给出任意一个，它使用pH = −log₁₀[H+]、[OH−] = Kw/[H+]和pH + pOH = pKw返回其他值，并将溶液分类为酸性、中性或碱性。strong端点根据强酸或强碱的摩尔浓度给出其pH（对于酸[H+] = c，对于碱[OH−] = c），当溶液稀释到水的自电离变得重要时发出警告。buffer端点应用Henderson–Hasselbalch方程，pH = pKa + log₁₀([A−]/[HA])，根据pKa和共轭碱与酸的比率（直接给出或作为两个浓度）计算缓冲液的pH，也处理基于pKb的碱缓冲液。Kw默认为1×10⁻¹⁴（25°C），可以为其他温度覆盖。所有计算都在本地确定性地进行，因此即时且私密。非常适合化学和生物学实验室工具、滴定和缓冲液制备应用、水处理和鱼缸软件以及科学教育。纯本地计算——无需密钥，无需第三方服务，即时。实时，不存储任何内容。3个端点。这是pH和酸碱化学；对于溶液稀释和摩尔浓度，请使用稀释API。

api.oanor.com/phcalc-api

Arrhenius reaction-kinetics maths as an API, computed locally and deterministically. The rate-constant endpoint applies the Arrhenius equation k = A·exp(−Ea/RT), relating the rate constant, the pre-exponential (frequency) factor A, the activation energy Ea and the absolute temperature: give any three and it solves for the fourth, with the activation energy in joules or kilojoules per mole and the temperature in kelvin or Celsius. The activation-energy endpoint uses the two-point method — from two rate constants measured at two temperatures it returns the activation energy, Ea = R·ln(k2/k1)/(1/T1 − 1/T2), and the pre-exponential factor. The temperature-effect endpoint gives the factor by which the rate changes between two temperatures, k2/k1 = exp(−Ea/R·(1/T2 − 1/T1)), along with the Q₁₀ — the rate multiplier per 10 K rise — and the new rate constant if you supply the old one. The gas constant R is 8.314462618 J/(mol·K). Everything is computed locally and deterministically, so it is instant and private. Ideal for chemistry and chemical-engineering tools, reaction and process-design apps, shelf-life and stability modelling, and physics education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is reaction kinetics; for the ideal gas law use a gas-law API and for radioactive decay use a half-life API.

api.oanor.com/arrhenius-api

Matemáticas de espectroscopia Beer–Lambert como API, calculadas local y determinísticamente. El endpoint beer-lambert aplica la ley A = ε·c·l, donde la absorbancia es igual a la absortividad molar por la concentración por la longitud del camino óptico: proporciona tres de los cuatro y resuelve el cuarto (la longitud del camino por defecto es la cubeta estándar de 1 cm cuando se omite), y siempre reporta la transmitancia y el porcentaje de transmitancia correspondientes. El endpoint transmittance convierte entre absorbancia y transmitancia en ambas direcciones, A = −log₁₀(T) y T = 10^(−A), y acepta una fracción o un porcentaje. El endpoint calibration lee una concentración a partir de una curva de calibración lineal, A = pendiente·c + intersección, resolviendo la concentración a partir de una absorbancia medida o la absorbancia esperada a partir de una concentración. Las unidades son las que proporciones de manera consistente — para absortividad molar en M⁻¹cm⁻¹, una longitud de camino en cm y absorbancia adimensional, la concentración resulta en molar. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para herramientas de química analítica y laboratorio, aplicaciones de espectrofotómetro y ensayos, software de biotecnología y educación, y calculadoras de control de calidad. Cálculo local puro — sin clave, sin servicio de terceros, instantáneo. En vivo, nada almacenado. 3 endpoints. Esto es espectroscopia Beer-Lambert; para dilución de soluciones y molaridad usa una API de dilución y para datos de compuestos químicos usa una API de química.

api.oanor.com/beerlambert-api

Laboratory dilution and molarity maths as an API, computed locally and deterministically. The dilution endpoint solves the standard C1·V1 = C2·V2 relation: give any three of the stock concentration, stock volume, final concentration and final volume and it returns the fourth, plus the volume of stock needed, the diluent to add (V2 − V1) and the dilution factor — and it warns you if the numbers would concentrate rather than dilute. The molarity endpoint ties together moles, molarity, volume, mass and molar mass via moles = molarity × volume(L) and mass = moles × molar mass: pass any sufficient subset (for example a target molarity, volume and molar mass) and it returns how much solute you need, with volumes in litres and millilitres and mass in grams and milligrams. The serial endpoint builds a serial-dilution series from a stock concentration, a dilution factor and a number of steps, giving the concentration at each tube and — if you pass a per-tube total volume — the transfer and diluent volumes for each step. Volumes accept litres, millilitres, centilitres, decilitres and microlitres; mass accepts grams, kilograms, milligrams and micrograms. Everything is computed locally and deterministically, so it is instant and private. Ideal for chemistry and biology lab tools, LIMS and bench apps, education and homework helpers, and pharmacy and pipetting calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is a dilution and molarity calculator; for chemical-compound data and properties use a chemistry API and for the ideal gas law use a gas-law API.

api.oanor.com/dilution-api

Ideal-gas-law maths as an API, computed locally and deterministically. The ideal endpoint solves PV = nRT for whichever quantity you leave out: provide any three of pressure, volume, amount of substance (moles) and temperature, and it returns the fourth in several units. The combined endpoint applies the combined gas law, P₁V₁/T₁ = P₂V₂/T₂: give a first state and two quantities of the second state and it finds the missing one — handy for "what happens to the volume if I double the pressure" questions. The density endpoint computes the density of an ideal gas from the pressure, temperature and molar mass (ρ = P·M / R·T). Pressure accepts pascals, kPa, bar, atm, psi, mmHg and Torr; volume accepts m³, litres, mL and cubic feet; temperature accepts kelvin, Celsius and Fahrenheit; and the gas constant R is 8.314462618 J/(mol·K). Everything is computed in SI internally and is instant and private. Ideal for chemistry and physics education, lab and process tools, HVAC and scuba calculations, and engineering software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is ideal-gas thermodynamics; for the chemical elements and periodic-table data use an elements API.

api.oanor.com/gaslaw-api

Crystal structures as an API — powered by the Crystallography Open Database (COD), the open, public-domain collection of over 500,000 crystal structures of organic, inorganic, metal-organic compounds and minerals. Search the database by chemical formula (any standard casing — TiO2, Al2O3, H2O — is normalised automatically) or by free text over mineral names, titles and comments, then look up any structure to get its full crystallographic data: chemical and cell formula, space group (Hermann-Mauguin and Hall), the complete unit cell (a, b, c, alpha, beta, gamma and volume), the source publication (title, authors, journal, year, DOI) and a link to the CIF file. From quartz, calcite and diamond to anatase, corundum and diopside, it is ideal for materials science, solid-state chemistry, mineralogy, crystallography teaching and research tooling. This is a crystal-structure & materials database — distinct from molecule-property (chemistry / PubChem) and protein-structure (PDB) databases. Open data from the Crystallography Open Database (CC0 / public domain).

api.oanor.com/cod-api

Chemical compound data as an API, powered by NIH PubChem (>100 million compounds). Look up any compound by common name, PubChem CID or SMILES and get its molecular formula, molecular and exact mass, IUPAC name, canonical SMILES, InChI and InChIKey, plus physicochemical properties (XLogP, TPSA, formal charge, hydrogen-bond donor/acceptor counts, rotatable bonds, heavy-atom count). List a compound's synonyms and trade/registry names, or resolve a name to PubChem CIDs. Ideal for cheminformatics, lab software, education, drug-discovery tooling and scientific data pipelines.

api.oanor.com/chemistry-api

The complete periodic table as an API — all 119 chemical elements with their atomic and physical properties: atomic number and mass, category, phase, melting and boiling point, density, electron configuration, electronegativity, ionization energies and a short summary. Look up an element by symbol, atomic number or name, search and filter by category/phase/block, or fetch the whole table. Ideal for chemistry tools, education apps and science projects.

api.oanor.com/elements-api