**(A):** Using phenolphthalein indicator, only half of is neutralized by .
**(R):** Phenolphthalein changes color at pH ~8.3, which corresponds to the conversion of to .

Question

**(A):** Using phenolphthalein indicator, only half of $Na_2CO_3$ is neutralized by $HCl$.
**(R):** Phenolphthalein changes color at pH ~8.3, which corresponds to the conversion of $Na_2CO_3$ to $NaHCO_3$.

Prashant Kotian · Accepted Answer

Correct answer: A. **Assertion:** Phenolphthalein marks the first stoichiometric end point. True.
**Reason:** The pH of a solution is approx 8.3, which is within the range of Ph. Further neutralization to happens at lower pH. True and explains the Assertion.

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