Question

The volume strength of 1.5 N H₂O₂ solution is(a) 4.8 (b) 8.4(c) 3.0 (d) 8.0

Answer 1

Volume strength refers to the number of volumes of oxygen gas evolved by one volume of H2O2.

This oxygen gas is evolved in the reaction:

2 H2O2 = 2 H2O + O2

Now, 1.5 N of H2O2 will contain 1.5 equivalents of H2O2 per litre.

1.5 equivalents of H2O2 means 1.5/2 = 0.75 moles of H2O2.

Now 0.75 moles of H2O2 form 0.75/2 moles of O2.

Therefore the 1.5 N solution of H2O2 forms 0.375 moles of O2.

If we assume that the reaction is taking place at STP, then 1 mole of oxygen gas will occupy a volume of 22.4 litres.

Therefore, 0.375 moles of oxygen will occupy a volume of 8.4 litres.