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Equivalent Mass of an Acid Calculator

Enter the Molecular Mass & Number of ionizable hydrogens of acid and hit calculate button to find the equivalent mass

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Equivalent Mass of an Acid Calculator

Equivalent Mass of an Acid Calculator is a tool that helps to find the mass of an acid using the molecular mass of the acid and the number of ionizable hydrogen ions of the acid.

What is meant by the Mass of the Acids?

The equivalent mass of an acid refers to the mass of the acid required to neutralize one equivalent of a base or react with one equivalent of another substance.

The equivalent mass also known as the equivalent gram represents the mass of an acid that can donate one equivalent of hydrogen ions (H+).

It is expressed in grams per equivalent mass (g/eq mass) and depends on the number of acidic hydrogens in the acid molecule.

mass of formic acid

Formula:

Em = Mw/H

Where,

  • Em = Equivalent mass of an acid
  • Mm = Molecular mass of acid
  • H = number of ionizable hydrogen ions

How to evaluate the Mass of the Acid?

Example 1:

Find the Equivalent mass of hydrochloric acid (HCl) if its molecular mass is approximately 36 and its number of ions is 4.

Solution:

Step 1: Write the data from the question.

 Mm = 36, H = 4, Em =?

Step 2: Write the formula of the weight of the acid.

Em = Mm/H

Step 3: Put all values in the above formula and simplify.

Em = 36/4

Em = 9

Example 2:

Find the Equivalent mass of Sulfuric Acid (H2SO4) if its molecular mass is approximately 96 and its number of ions is 12.

Solution:

Step 1: Write the data from the question.

 Mm = 96, H = 12, Em =?

Step 2: Write the formula of the mass of the acid.

Em = Mm/H

Step 3: Put all values in the above formula and simplify.

Em = 96/12

Em = 8

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