The pH of milk, black coffee, tomato jui | Class 11 Chemistry Chapter Equilibrium, Equilibrium NCERT Solutions

Question:

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:

pH = -log [H+]

(i) pH of milk = 6.8

Since, pH = -log [H+]

6.8 = -log [H+]

log [H+] = -6.8

[H+] = anitlog(-6.8)

= 1.5x10-7M

 

(ii) pH of black coffee = 5.0

Since, pH = -log [H+]

5.0 = -log [H+]

log [H+] = -5.0

[H+] = anitlog(-5.0)

= 10-5M

 

(iii) pH of tomato juice = 4.2

Since, pH =-log [H+]

4.2 =-log [H+]

log [H+] = -4.2

[H+] = anitlog(-4.2)

= 6.31x10-5M

 

(iv) pH of lemon juice = 2.2

Since, pH = -log [H+]

2.2 = -log [H+]

log [H+] = -2.2

[H+] = anitlog(-2.2)

=6.31x10-3M

 

(v) pH of egg white = 7.8

Since, pH = -log [H+]

7.8 = -log[H+]

log[H+] = -7.8

[H+] = anitlog(-7.8)

= 1.58x10-8M


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Welcome to the NCERT Solutions for Class 11 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 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....