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Amino Acids

If 1 stands...

Question

If $1$ stands for true and $0$ stands for false, then choose the correct code for the following statement.
Only $50 %$ of $N a_{2} C O_{3}$ solution is indicated if it is neutralised by $H C l$ using phenolphthalein as the indicator.

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Solution

Phenolphthalein indicator operates in the pH range $8.0 - 9.8$ . At this pH, only one hydrogen ion can be added to carbonate ion to form bicarbonate ion.
Hence, only $50 %$ of sodium carbonate solution is indicated if it is neutralized by $H C l$ using phenolphthalein as an indicator.
Methyl red indicator operates in the pH range $4.2 - 6.3$ . At this pH, two hydrogen ions can be added to carbonate ion to form carbonic acid.
Hence, $100 %$ of sodium carbonate solution is indicated if it is neutralized by $H C l$ using methyl red as the indicator.

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