The pH of water at 25°C is 7. When it is heated to 100°C, the pH of

1.	The pH of water at 25°C is 7. When it is heated to 100°C, the pH of water (a) Increases (b) Decreases (c) Remains same (d) Decreases up to 50°C and then increases
Answer» The correct option is: (b) Decreases Explanation: Dissociation of water is temperature dependent H₂O ⇋ H⁺ + OH^– Dissociation constant = K_w = [OH^–] [H⁺] Water at 100°C will have more of the molecules dissociated to ions then at 25°C i.e., K_w increase with increase in temperature. ∴ pH of water decreases on increasing temperature. At 100°C pH of water becomes 6.14.

The pH of water at 25°C is 7. When it is heated to 100°C, the pH of water (a) Increases (b) Decreases (c) Remains same (d) Decreases up to 50°C and then increases

Answer»

The correct option is: (b) Decreases

Explanation:

Dissociation of water is temperature dependent

H₂O ⇋ H⁺ + OH^–

Dissociation constant = K_w = [OH^–] [H⁺] Water at 100°C will have more of the molecules dissociated to ions then at 25°C i.e., K_w increase with increase in temperature.

∴ pH of water decreases on increasing temperature.

At 100°C pH of water becomes 6.14.

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The pH of water at 25°C is 7. When it is heated to 100°C, the pH of water (a) Increases (b) Decreases (c) Remains same (d) Decreases up to 50°C and then increases

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