Question

How can I find the equivalent weight for a salt.Explain using BaCl2.

Answer 1

Equivalent weight depends on type of the substance.

For example,

Equivalent weight of acid = molecular weight of acid/basicity of acid

The acid H2SO4 can donate 2 hydrogens. So, the basicity of H2SO4 is 2

Equivalent weight of H2SO4 = 98 /2 = 49 g/eq

Equivalent weight of base = molecular weight of base/acidity of acid

The base NaOH can donate 1 hydroxide ion (OH-). So, the basicity of NaOH is 1

Equivalent weight of NaOH = 40 /1 = 40 g/eq

Equivalent weight of salt = molecular weight of salt/charge present on ionic form

The salt Na2CO3 ionizes to form 2Na+ and CO3(–2). So, the charge present on both

ions is 2.

Equivalent weight of Na2CO3 = 106 /2 = 53 g/eq