Question

25 ml of the given $HCl$ solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this $HCl$ solution required to titrate 30 mL of 0.2 M aqueous $NaOH$ solution?

• A. 25 mL
• B. 50 mL
• C. 12.5 mL
• D. 75 mL

Answer 1

Answer: (A)

25 mL

$HCl$ with $N{a}_{2}C{O}_3$

Eq. of $HCl=$ eq. of $N{a}_{2}C{O}_3$

$\frac{25}{1000}\times M\times 1=\frac{30}{1000}\times 0.1\times 2$
$M=\frac{6}{25}M$

Eq of $HCl=$ Eq. of $NaOH$

$\frac{6}{25}\times 1\times \frac{V}{1000}=\frac{30}{1000}\times 0.2\times 1$

$V=25ml$

Hence, the correct option is $A$