TS EAMCET · Chemistry · Hydrogen
Solution " \(X\) " contains \(\mathrm{Na}_2 \mathrm{CO}_3\) and \(\mathrm{NaHCO}_3\). \(20 \mathrm{~mL}\) of \(X\) when titrated using methyl orange indicator consumed \(60 \mathrm{~mL}\) of \(0.1 \mathrm{M}\) \(\mathrm{HCl}\) solution. In another experiment, \(20 \mathrm{~mL}\) of \(X\) solution when titrated using phenolphthalein consumed \(20 \mathrm{~mL}\) of \(0.1 \mathrm{M}\) \(\mathrm{HCl}\) solution. The concentrations (in \(\mathrm{mol} \mathrm{L}^{-1}\) ) of \(\mathrm{Na}_2 \mathrm{CO}_3\) and \(\mathrm{NaHCO}_3\) in \(X\) are respectively
- A \(0.01,0.02\)
- B \(0.1,0.1\)
- C \(0.01,0.01\)
- D \(0.1,0.01\)
Answer & Solution
Correct Answer
(B) \(0.1,0.1\)
Step-by-step Solution
Detailed explanation
For titration of a basic solution of \(\mathrm{Na}_2 \mathrm{CO}_3\) and \(\mathrm{NaHCO}_3\) against \(\mathrm{HCl}\), if phenolphthalein is used as indicator, the end point is indicated only for half neutralization of \(\mathrm{Na}_2 \mathrm{CO}_3\), i.e., (upto…
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