Question

on dissolving 1 mole each of the following acids in 1lit water the acid which do not give a solution of 1N strength is 1) HCl 2) HClO4 3)HNO3 4)H3PO4

Answer 1

Normality = Molarity × n-factor

where n factor is the number of replaceable hydrogen ions per molecules.

The molarity for all given acids are 1M as

Molarity = no of moles/ Volume of solution (L)

For

1. HCl,        N = 1M × 1 = 1N
2. HClO₄,    N = 1M × 1 = 1N
3. HNO₃,     N = 1M × 1 = 1N
4. H₃PO₄,    N = 1M × 3 =3N

Therefore the correct answer is option 4.

Answer 2

Concept:

• Molarity
• Normality
• Converting molarity to normality and vice versa
• n-factor

Given:

• number of moles = 1
• the volume of water =1L
• The acids HCl, HClO4, HNO3, H3PO4

Find:

• The acid solution which does not have a normality 1N

Solution:

Molarity = number of moles/volume of solution in litres

Molarity = 1M

Normality = Morality * n-factor

1) HCl

n factor = 1

Normality = 1*1 = 1N

2) HClO4

n factor = 1

Normality = 1*1 = 1N

3) HNO3

n factor = 1

Normality = 1*1 = 1N

4) H3PO4

n factor = 3

Normality = 1*3 = 3N

The H3PO4 solution does not have a normality 1N.

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