Question

The density of 1.85 mass per cent calcium hydroxide solution is 1.025 g cm. The volume of 0.1 M HCl solutions
would be required to neutralise 25 mL of this solution is? (Answer is 127.5 ml need explanation)

Answer 1

GIVEN:-

Molarity of HCl solution = 1M

Volume of the solution = 360mL

To Find :

Mass of calcium hydroxide required to completely neutralize this HCl solution.

Solution :

■ First of all let's write chemical reaction :-

2HCl+Ca(OH)_2

CaCl_2+2H_2O

As per chemical reaction,

One mole of calcium hydroxide reacts with two moles of hydrochloric acid solution.

•

Mass of 1 mole of Ca(OH)₂ : 74g

Mass of 2 moles of HCl : 73g

■ Let's find mass of HCl present in the solution.

We know that

/volume

mole

molarity =

• 1 = mole/0.36 (L)