# How to Calculate the Molarity of a Vinegar Sample

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The molarity of vinegar is the number of moles of acetic acid --- the compound that gives vinegar its flavor and scent --- per liter of vinegar solution. Store-bought vinegar doesn't generally list the molarity on the bottle; usually it reports the concentration as a percentage instead. Nonetheless, you can take this percentage and use it to compute the molarity of your vinegar. The good news is that the math is pretty easy, too.

### Things You'll Need

• Bottle of vinegar
• Calculator
• Pencil
• Paper
• Look at the container of vinegar you bought from the store; it should list a pentent concentration or percent acidity somewhere on the bottle. This number is the number of grams of acetic acid per 0.1 liters of vinegar solution.

• Divide this number by 60.05 grams per mole, which is the molar mass of acetic acid. If the vinegar is 5 percent, for example, 5 / 60.05 = 0.083 moles per 0.1 liters of vinegar. You're not quite done yet, however. This answer gives moles per 0.1 liter, whereas you want moles per liter.

• Multiply the answer from the last step by 10. This gives you the molarity or moles per liter. If the vinegar is 5 percent, then, it has 0.83 moles of acetic acid per liter of vinegar.

## References

• Photo Credit Hemera Technologies/PhotoObjects.net/Getty Images
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