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JEE Main 202325 JanuaryEvening Shift
Exam
JEE Main
Year
2023
Date
25 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Ionic Equilibrium

JEE Main 2023 · 25 January · Evening Shift · Chemistry · Ionic Equilibrium

When the hydrogen ion concentration [ H ^ + ] changes by a factor...

When the hydrogen ion concentration [H+]\left[{H}^{+}\right]changes by a factor of 10001000 , the value of pHpH of the solution

Options

  1. Aincreases by 10001000 units
  2. Bdecreases by 33 units
  3. Cdecreases by 22 units
  4. Dincreases by 22 units

Correct answer

B. decreases by 33 units

Step-by-step solution

Let the initial concentration of H+{H}^{+} be 1

∴[H+]i=1⇒pH=0∴ \left[{H}^{+}\right]i = 1 ⇒ pH = 0

It changes by 1000 units

∴[H+]f=103⇒pH=−3∴ \left[{H}^{+}\right]f = {10}^{3} ⇒ pH = - 3

So, pH decreases by 3 units.

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