Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 21

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Chemistry Class 11 NCERT Solutions Chapter 7 Equilibrium Part 21

Q: 56. The pH of milk, black coffee, tomato juice, lemon juice and egg white are 6.8, 5.0, 4.2, 2.2 and 7.8 respectively. Calculate corresponding hydrogen ion concentration in each.

Answer:

The hydrogen ion concentration in the given substances can be calculated by using the given relation

(i)

Since,

(ii) of black coffee = 5.0

Since,

(iii) of tomato juice = 4.2

Since,

(iv) pH of lemon juice = 2.2

Since,

(v) Of egg white = 7.8

Since,

Q: 57. If 0.561 g of KOH is dissolved in water to give 200 mL of solution at 298 K. Calculate the concentrations of potassium, hydrogen and hydroxyl ions. What is its pH?

Answer:

Q: 58. The solubility of at 298 K is of solution. Calculate the concentration of strontium and hydroxyl ions and the pH of the solution

Answer:

Solubility of

Then, concentration of

Now,