# Equivalent Weight Calculator

Take the help of the free Equivalent Weight Calculator tool to know the equivalent weight of a chemical reaction in a fraction of seconds. Just you have to give the molecular weight of acid, basicity of acid, unknown value as x and press the calculate button to avail the output.

### Steps to Calculate Equivalent Weight

Following are the simple steps to find the equivalent weight of a reaction.

- Get the molecular weight and valency of the reaction.
- Divide the molecular weight by the valency.
- Otherwise, find the ratio of molecular weight to the basicity of the acid to check the EW.

### Equivalent Weight & Formula

The number of substances that completely react with each other in a reaction is the equivalent weight.

In chemistry, the ratio of molecular weight to valency is called the equivalent weight. It is used to predict the mass of the substance in a reaction and find the normality of the solution.

The formulas to calculate the equivalent weight is

**Equivalent weight = molecular weight/valency**

molecular weight = equivalent weight x valency

valency = molecular weight/equivalent weight

The equivalent weight of an acid = molecular weight of acid/basicity

Equivalent weight of base = molecular weight of base/acidity

Equivalent weight of salt = molecular weight of slat/total positive valency of metal atoms.

**Examples:**

**Question1: Find the equivalent weight of H2SO4?**

Answer:

Given that,

H2SO4 → 2H+ + SO4-2

The number of hydrogen ions released by the acid is 2.

So, valency is 2.

Molecular weight of sulphuric acid is 98 grams per mole

Equivalent weight = molecular weight/valency

= 98/2 = 49

Therefore, the equivalent weight of H2SO4 is 49.

**Question2: Calculate equivalent weight of aluminium hydroxide?**

Answer:

Given that,

Al(OH)3 → Al+3 + 3 OH-

The released hydroxide ions is 3.

So, the valency is 3

Molecular weight of Al(OH)3 is 78 g/mol

Equivalent weight = molecular weight/valency

= 78/3 = 26

Therefore, the aluminium hydroxide equivalent weight is 26

Stay tuned to Chemistrycalc.Com to know more about the other chemical calculators.

### FAQ’s on Equivalent Weight Calculator

**1. What is the equivalent weight formula?**

The equivalent weight formula is EW = molecular weight/valency.

**2. What is meant by equivalent weight?**

The equivalent weight of a solution can be defined as the ratio of the molecular weight to the valency of the solute. The number of reactants that completely react with each other in a chemical reaction is called the equivalent weight.

**3. How to find the equivalent weight of an element?**

To calculate equivalent weight of a reaction, get the molecular weight and basicity of the acid. Divide the molecular weight by the basicity to obtain the weight equivalent.

**4. What is the equivalent weight of HCl?**

The hydrochloric acid reaction is HCl → H+ + Cl-

Valency is 1 because the number of hydrogen ions in the reaction is 1.

Molecular weight of HCl = 36.45

Equivalent weight = molecular weight/valency

= 36.45/1 = 36.45