A mixture of and required mL of using phenolphthalein. Another mL of the same was required to reach the methyl orange endpoint. The moles of in the mixture are:

Question

A mixture of $NaOH$ and $Na_2CO_3$ required $25$ mL of $0.1 M$ $HCl$ using phenolphthalein. Another $10$ mL of the same $HCl$ was required to reach the methyl orange endpoint. The moles of $Na_2CO_3$ in the mixture are:

Prashant Kotian · Accepted Answer

Correct answer: A. **Step 1:** In the second stage (from Ph to MeOH), only (formed from ) is neutralized.
Meq = Meq in 2nd stage = .
Moles .

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