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NCERT Class XI Chemistry Equilibrium Solutions

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Question : 56 of 73
Marks: +1, -0
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+][\mathrm{H}^{+}] = antilog (–pH) = antilog (–6.8) = 1.58 × 10−7 M10^{-7}\,\mathrm{M}
For black coffee, pH = 5.0
∴ [H+][\mathrm{H}^{+}] = antilog (–pH) = antilog (–5.0) = 1 × 10−5 M10^{-5}\,\mathrm{M}
For tomato juice, pH = 4.2
∴ [H+][\mathrm{H}^{+}] = antilog(–pH) = antilog (–4.2) = 6.31 × 10−5 M10^{-5}\,\mathrm{M}
For lemon juice, pH = 2.2,
∴ [H+][\mathrm{H}^{+}] = antilog (–pH) = antilog (–2.2) = 6.31 × 10−3 M10^{-3}\,\mathrm{M}
For egg white, pH = 7.8
∴ [H+][\mathrm{H}^{+}] = antilog (–pH) = antilog (–7.8) = 1.58 × 10−8 M10^{-8}\,\mathrm{M}
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