Question

The volume of water to be added to 100 cm3 of 0.5 n h2so4 to get decinormal concentration is

Answer 1

Given N as the normality, a decinormal concentration would be :

N/10

In this case :

0.5/10 = 0.05

To convert it to N we have :

0.05×2 = 0.1

Using dilution formula :

N₁V₁ = N₂V₂

Where V is the volume and N the normality.

Doing the substitution:

0.5 × 100 = 0.1 × V₂

V₂ = ( 0.5 × 100) / 0.1

V₂ = 500 cm³

Given that the initial volume that was there is 100 cm³ the volume required is :

500 - 100 = 400 cm³

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