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What would the word equations be for the following two situations?

Initially $\ce{Na2CO3}$ and $\ce{NaHCO3}$ were present as 2 unknown powders, dissolved in water, and phenolphthalein was added to identify them.

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Phenolphthalein is colorless for acidic solution, viz. upto $\mathrm{p}H=8$, and for $\mathrm{p}H>8$, it shows pink color. $\ce{NaHCO3}$ is an amphoteric salt with $\mathrm{p}H$ value close to 8, so phenolphthalein will be colorless. But $\ce{Na2CO3}$ being a basic salt, solution will show pink color.

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