NEETChemistryIonic Equilibrium
2. Given below are two statements Statement I: The changes in pH with temperature are so small that we often ignore it Statement II: When the hydrogen ion concentration changes by a factor of 100 , the pH changes by one unit In the light of above statements, identify the correct answer from the options given below
Options
- ABoth statements I and II are correct.
- BBoth statements I and II are not correct.
- CStatement I is correct but statement II is not correct.
- DStatement I is not correct but statement II is correct.
Correct answer
C. Statement I is correct but statement II is not correct.
Step-by-step solution
A small change in temperature has little impact on the pH of a solution as the concentration of the H ⁺ ions does not change much. Thus, statement I is correct. aligned & pH ₁=- [ H ⁺ ]₁ so if [ H ⁺ ]₂=100 [ H ⁺ ]₁ & aligned pH ₂ & =- [ H ⁺ ]₂=- (100 [ H ⁺ ]₁ ) & =- (100)+ [- [ H ⁺ ]₁ ] & =-2+ pH ₁= pH ₁-2 aligned aligned Thus, pH changes by two units. Therefore, statement II is incorrect.