Question

Question #9387a

Answer 1

The sp.gravity of hydrochloric acid solution is 1.17.

So its density`= 1.17gcm^-3`

So volime of 100g acid solution is`="mass"/"density"=100/1.17cm^3`
This 100g acid solution contains 33.4g acid.

`"1L solution contains "33.4/(100/1.17)*1000g` acid
`=(33.4*1.17*1000)/100=390.78g` acid.

Now the balanced equation of the reaction

`HCl+NaOH->NaCl+H_2O`

This equation reveals that 1mol HCl or 36.5g HCl neutralises 1 mol NaOH or 40g NaOH.
Given that 1cc NaOH solution contains 0.042g NaOH.
1L solution contains 42g NaOH

Hence 5L NaOH will be neutralised by `40/36.5*42*5g`HCl

`=230g` HCl

So volume of HCl solution required for neutralisation
`=230/390.78L=0.59L`