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L-Malic acid: molecular weight (formula weight)
L-Malic acid, C4H6O5 as weighed (Hill order), has a formula weight of 134.087 g/mol.
Weigh the form on your label, and if the label or certificate gives a formula weight, use that. A hydrate and its anhydrous form are not interchangeable: the same mass of each holds a different amount of substance.
Read the supplier's safety data sheet before you handle this reagent.
Molar mass is the SI name for this quantity; formula weight is the usual term for a salt or a hydrate, and labels and searches usually say molecular weight. On this page all three mean the mass of one mole of the formula as written, in grams per mole.
Atomic weights are the CIAAW standard values, with the conventional value for elements whose atomic weight varies in nature, such as hydrogen, carbon, sulfur, chlorine and lithium. The last decimal place is arithmetic, not measured precision: a real sample's formula weight can differ in the second decimal place, and by more for lithium salts.
The molarity calculator is open below in Drybench Calc with this reagent chosen; it shows the formula weight to two decimal places. Enter your concentration and volume there; nothing you do here is saved unless you save it.
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L-Malic acid in the molarity calculator
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Not medical advice. For research and education only, and not medical advice: the stock, dilution and buffer calculations here are not for dosing or clinical preparation.
Element composition, as weighed
Element
Mass percent
C
35.83
H
4.51
O
59.66
Making a solution
For a molar concentration, mass = concentration × volume × formula weight, assuming the reagent is pure; dissolve, then make up to the final volume. The calculator above uses this formula weight. The conversions below are arithmetic on this formula weight, not example stocks.
Mass for a concentration, by arithmetic
For L-Malic acid as weighed (C4H6O5, 134.087 g/mol), the table converts between concentration and mass of solid per volume of final solution. It is arithmetic on the formula weight (mass = concentration × volume × formula weight), assuming a pure reagent made up to volume, and nothing else: it does not say whether L-Malic acid dissolves at any of these concentrations, in what solvent, at what temperature, or what the pH would be. Whether a concentration can be made is a separate question, answered with a cited solubility; this page does not answer it.
Concentration
mg per mL (the same number in g per L)
1 mM
0.1341
10 mM
1.341
100 mM
13.41
1 mg/mL of L-Malic acid is 7.458 mM.
Weigh the form on your label; if the label or certificate gives a formula weight, use that.
How this page was made
Computed when the site was built by the Drybench Calc formula-mass engine, version 1.0.0, from /data/lab-calculators/reagents.e8f6883588.json (built 2026-11-07) with CIAAW 2021 atomic weights. Every formula weight, percent and conversion on this page was compared with CIAAW 2021 sum in Python decimal (reference.py's transcription) (Python 3.13.18); a disagreement stops the build. PubChem's weight (read 2026-11-07) is shown as a cross-check, not as the source.
Link to and cite this page
Link to this page
https://www.drybench.com/calc/reagents/malic-acid
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Drybench. L-Malic acid: molecular weight (formula weight). Drybench Calc0.9.3; reagent table built 2026-11-07, CIAAW 2021 atomic weights, checked against CIAAW 2021 sum in Python decimal (reference.py's transcription). https://www.drybench.com/calc/reagents/malic-acid. Accessed [date].
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