Two samples of HCl having 1M and 0.25 M are mixed. Find the volumes of these samples respectively taken in order to prepare 0.75 M HCl solution.

Options

A. 20 ml, 10 ml
B. 100 ml, 50 ml
C. 40 ml, 10 ml
D. 20 ml, 40 ml

Answer

A, B

Explanation

`0.75 = (1xx V_(1)+0.25xxV_(2))/(V_(1)+V_(2))`
`0.75 = (V_(1))/(V_(2))=0.75 = (V_(1))/(V_(2))+0.25`
`(V_(1))/(V_(2))(0.25)=0.5,(V_(1))/(V_(2))=(2)/(1)`