Question

Statement 1: In the titration of $Na_2CO_3$ with $HCl$ using methyl orange indicator, the volume of acid required is twice that of the acid required using phenolphthalein as indicator.
Statement 2 : Two moles of $HCl$ are required for the complete neutralisation of one mole of $Na_2CO_3$.

• A. If both Statement $1$ and Statement $2$ are true and the statement $2$ is the correct explanation of the statement $1$
• B. If both Statement $1$ and Statement $2$ are true but statement $2$ is not the correct explanation of the statement $1$
• C. If Statement $1$ is true but Statement $2$ is false
• D. If Statement $1$ is false but Statement $2$ is true

Answer 1

Answer: (B)

$Na_2CO_3 + 2 HCl \to 2Na Cl + H_2O + CO_2$,
phenolphthalein is used for
$Na_2CO_3 + 2 HCl \to NaHCO_3 + NaCl + CO_2$