Question

Calculate the volume of the 80% h2so4 by weight density 1.8 /mol required to prepare 1L of 0. 2 M solution

Answer 1

Dear student,

There is a little correction in the question. Density of 80% sulphuric acid would be 1.8 g/ml not 1.8g/mol.

First you have to calculate the molarity of 80% acid solution which will act as stock solution.

By using the given density 1.8 g/mL

1800 g for 1 litre

Thus, 80% X 1800 =1440g acid required

Since, molarity = weight taken/ formulae weight

Weight taken=1440 and
formulae weight of sulphuric acid=98.08

=> 1440/98.08= 14.68 M

Now molarity of stock solution 14.68M

In next step we require 0.2 M acid solution from 14.68M stock solution.

We can use the formulae

M1* V1= M2* V2

Applying values M2=0.2
V2=1000 ml
M1=14.68

volume required (V1) = (0.2 X 1000) / 14.68

=200/14.68

= 13.62 ml

So 13.62 ml volume of 80 % sulphuric acid is required.

Hope you understood

Regards