NCERT Class XI Chemistry Equilibrium Solutions

Question : 56

Total: 73

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.

Solution:

For milk, pH = 6.8
∴ [H+] = antilog (–pH) = antilog (–6.8) = 1.58 × 10–7M
For black coffee, pH = 5.0
∴ [H+] = antilog (–pH) = antilog (–5.0) = 1 × 10–5M
For tomato juice, pH = 4.2
∴ [H+] = antilog(–pH) = antilog (–4.2) = 6.31 × 10–5M
For lemon juice, pH = 2.2,
∴ [H+] = antilog (–pH) = antilog (–2.2) = 6.31 × 10–3M
For egg white, pH = 7.8
∴ [H+] = antilog (–pH) = antilog (–7.8) = 1.58 × 10–8M

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