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)

$HCl$ with $Na _2 CO _3$
Eq. of $HCl =E q$. of $Na _2 CO _3$
$E q$ of $HCl =E q$. of $NaOH$
$\frac{6}{25} \times 1 \times \frac{V}{1000}=\frac{30}{1000} \times 0.2 \times 1$
$V=25 ml$