Question

There are two samples of HCl having molarity 1M and 0.25N. Find the volume of these sample taken in order to prepare 0.75N HCl solution (Assume no water is used):

• A. 20 mL, 10 mL
• B. 100 mL, 50 mL
• C. 40 mL, 20 mL
• D. 50 mL, 25 mL

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A

20 mL, 10 mL

B

100 mL, 50 mL

C

40 mL, 20 mL

D

50 mL, 25 mL

$\frac{\left(20\right)\left(1\right)+\left(10\right)\left(0.25\right)}{20+10}=0.75\frac{\left(100\right)\left(1\right)+\left(50\right)\left(0.25\right)}{150}=0.75\frac{\left(40\right)\left(1\right)+\left(20\right)\left(0.25\right)}{60}=0.75\frac{\left(50\right)\left(1\right)+\left(25\right)\left(0.25\right)}{75}=0.75$