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JEE Main202523 Jan 2025Evening ShiftChemistryIonic EquilibriumActual

pH of water is 7 at 25^ C . If water is heated to 80^ C ., it's pH will :

Options

  1. ADecrease
  2. BH ⁺ concentration increases, OH ⁻ concentration decreases
  3. CRemains the same
  4. DIncrease

Correct answer

A. Decrease

Step-by-step solution

At 25^ C , pure water has pH =7 As temperature increased, water molecules dissociate more into hydrogen ions ( H ⁺ ) and hydroxide ions ( OH ⁻ ) . This increased dissociation leads to slightly decrease in pH . At 80^ C , pH 6.93

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