Why sodium bicarbonate does not react with hcl in the presence of phenolphthalein?
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Phenolphthalein changes color between 8–10 and the pH of bicarbonate (formed after half-titration ofcarbonate) lies in this range. ... The pH at this point isn't alkaline enough for phenolphthalein to become colourless. Then reacts.
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Answer: Sodium Bicarbonate Has pKa 6.56 while that of sodium hydroxide is 10.56, so bicarbonate is more acidic.
Thus, till first end, only carbonate reacts as it is more basic. After complete conversion to bicarbonate, the bicarbonate ions can begin reacting with HCl
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