Question

Two samples of HCl of 0.1 M and 0.25 M are mixed. Find the volume of these samples taken in order to prepare 0.75 M HCl solution. Assume no water is added
(i) 20 mL, 10 mL
(ii) 100 mL, 50 mL
(iii) 40 mL, 20 mL
(iv) 50 mL, 25 mL

Answer 1

All the options are correct by simple formula m1v1+m2v2=mfinalvfinal

Answer 2

Answer:

option (a)

Explanation:

As per the law of Dilution,

(1 *20) + (0.25*10) = M* 30

Molarity = 0.75 M

Option (b)

(1*100) +(0.25*60) = (M* 160)

Molarity  = 0.72 M

Option (c)

(1*50) +(0.25*20) = (M*70)

M = 0.78 M

Option d,

(1*50) + (0.25*35) = (M *85)

M = 0.69 M