Equivalent Weight Calculator

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Equivalent Weight Calculator:

Enter the values of molecular weight, MW(g/mol) and  relevant property, ΔE to determine the value of Equivalent Weight, EW(g/mol).

Enter Molecular Weight: g/mol
Enter Relevant Property:
   
Result – Equivalent Weight: g/mol

Equivalent Weight Formula:

Equivalent weight (EW) refers to the mass of a substance that reacts with or supplies one mole of a standard substance in a chemical reaction. In the context of chemistry and material science, the concept of equivalent weight is important for determining how a material will react with other substances or how it will behave under certain conditions.

The equivalent weight is particularly useful in acid-base reactions, redox reactions, and electrolysis, where the amount of substance reacting is more important than its total mass.

The equivalent weight can be calculated based on the molecular weight (MW) and the change in a relevant property (ΔE) during a reaction, for example, the change in pH or the number of electrons exchanged in a redox process.

Where:

  1. Molecular Weight (MW) is the mass of one mole of the substance (in grams per mole).
  2. Change in Property (ΔE) refers to a measurable change that occurs during the chemical reaction (for example, the number of electrons exchanged in a redox reaction or any other relevant change).

Equivalent Weight, EW(g/mol) in grams per mole is determined by dividing the molecular weight, MW(g/mol) in grams per mole of a substance by the change in the relevant property, ΔE.

Equivalent Weight, EW(g/mol) = MW(g/mol) / ΔE

EW(g/mol) = equivalent weight in grams per mole, g/mol.

MW(g/mol) = molecular weight in grams per mole, g/mol.

ΔE = relevant property.

Equivalent Weight Calculation:

  1. A substance has a molecular weight of 180 g/mol and undergoes a reaction where the change in the number of electrons transferred (ΔE) is 2. Calculate the equivalent weight of the substance.

Given: MW(g/mol) = 180g/mol, ΔE = 2.

Equivalent Weight, EW(g/mol) = MW(g/mol) / ΔE

EW(g/mol) = 180 / 2

EW(g/mol) = 90g/mol.

  1. If the equivalent weight of a substance is 40 g/mol and the change in electrons (ΔE) during the reaction is 4, calculate the molecular weight of the substance.

Given: EW(g/mol) = 40g/mol, ΔE = 4.

Equivalent Weight, EW(g/mol) = MW(g/mol) / ΔE

MW(g/mol) = EW(g/mol) * ΔE

MW(g/mol) = 40 * 4

MW(g/mol) = 160g/mol.

 

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