Disclaimer

The calculators on this site are for study and lab planning. A result follows from a standard formula and the numbers you enter; it is only as good as those numbers and the assumptions the page states.

• Not for clinical or medication use. Do not use any result to prepare, dose or dilute a medicine, an injection, an infusion or anything given to a person or an animal.
• Lab safety is yours. Follow your written method, the safety data sheet (SDS) of every chemical and your supervisor or safety officer. A calculator does not know whether a mixture, a reaction or a concentration is safe, and it gives no handling or disposal advice.
• Assumptions matter. Ideal-gas behaviour, complete dissociation, 25 °C constants, dilute solutions and additive volumes are approximations; the pages say which ones they use. A pH meter, a balance and a calibrated volumetric flask are the real check.
• Data. Atomic weights are IUPAC standard atomic weights in their abridged form; the molar mass of a real sample can differ slightly with its isotopic composition, purity and water content.

If a result looks wrong, please report it. See also method and constants and the terms of use.