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JEE Main 202523 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
23 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Ionic Equilibrium

JEE Main 2025 · 23 January · Evening Shift · Chemistry · Ionic Equilibrium

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

pH of water is 7 at 25∘C25^{\circ} \mathrm{C}. If water is heated to 80∘C80^{\circ} \mathrm{C}., it's pH will :

Options

  1. ADecrease
  2. BH+\mathrm{H}^{+}concentration increases, OH−\mathrm{OH}^{-}concentration decreases
  3. CRemains the same
  4. DIncrease

Correct answer

A. Decrease

Step-by-step solution

At 25∘C25^{\circ} \mathrm{C}, pure water has pH=7\mathrm{pH}=7 As temperature increased, water molecules dissociate more into hydrogen ions ( H+\mathrm{H}^{+}) and hydroxide ions \left(\mathrm{OH}^{-}\right).ThisincreaseddissociationleadstoslightlydecreaseinpH.At. This increased dissociation leads to slightly decrease in pH . At80^{\circ} \mathrm{C}, \mathrm{pH} \approx 6.93
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