why the indicator does not get affected by salt
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Because salt is crystalline solid
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No. Many pH indicators are weak acids or weak bases that change color when the pH is above or below the indicators pKa. For example take a look at p-nitrophenol (pKa ~ 7.2):
If the solution’s pH is below the pKa, p-nitrophenol exists in it’s acidic form (left) which is colorless. If the pH rises above the pKa (> ~7.2), the p-nitrophenol loses a hydrogen from it’s hydroxyl group. When this happens the solution will turn yellow due to the presence of the p-nitrophenolate ion.
Sodium Chloride is considered a neutral salt because it is formed from the reaction of a strong acid with a strong base:
Neutral salts don’t hydrolyze and even if they did, you wouldn’t be able see any observable color changes at varying pH levels.
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