Question

The volume of 10 N and 4N HCI required to make 1 L of 7 N HCL are

• A. 0.5 L of 10 N HCI and 0.5 L of 4N HCI
• B. 0.6L of 10 N HCI of 0.4 L of 4N HCI
• C. 0.8 L of 10 N HCI & 0.2 L of 4 N HCI
• D. 0.75 L of 10 N HCI of 0.25 L of 4N HCI

Answer 1

The correct option is A 0.5 L of 10 N HCI and 0.5 L of 4N HCI

$N_1{V}_1+N_2{V}_2=NV$
Where $V_1+V_2=1L$
Or $V_2=(1-V_1)L$
$10\times V_1+4(1-V_1)=1\times 7$
$10V_1+4-4V_1=7$
$6V_1=3$
$V_1=\frac{3}{6}=0.5L$
$V_2=0.5L$