Question

How many gram of concentrated sulphuric acid should be used to prepare 200 ml of 2m h2 s o4 the concentrated acid is 70%?

Answer 1

Answer:

you are saying concentrate is 70 %

I'll take it as the amount of acid is 70 in 100

answer is 56 grams

Explanation:

the no of moles of H2SO4 in the solution will be 0.4

2moles in 1000ml

2/1000 miles in 1ml

2*200/1000 moles in 200ml

= 0.4 moles

thus the weight required is 0.4 *98 grams

that is 39.2

now as the concentrate is 70% we let the weight of solution be x

thus 0.7*x = 39.2

which gives x =56