Which one of the following substances when added to water will not change the pH ........

Science and technology and computer Chemistry

Which one of the following substances, when added to water, will not change the pH ?

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EPFO AO EO 2021

NaHCO₃

NH₄C1

N_a2CO₃

NaCI

- NaHCO3 (Sodium bicarbonate):

- This is a weak base and will *increase* the pH when dissolved in water.

- NH4Cl (Ammonium chloride):

- This is a salt of a weak base (NH3) and strong acid (HCl), making the solution *acidic* (pH decreases) when dissolved.

- Na2CO3 (Sodium carbonate):

- This is a basic salt (from strong base and weak acid), so it will *raise* the pH.

- NaCl (Sodium chloride):

- This is a neutral salt (from strong acid HCl and strong base NaOH), so it will *not change the pH* of pure water.

Correct Answer: Option:4–NaCl

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