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प्रश्न
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.
उत्तर
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)
`= 1.5 xx 10^(-7) :M"`
(ii) pH of black coffee = 5.0
Since, pH = –log [H+]
5.0 = –log [H+]
log [H+] = –5.0
[H+] = anitlog(–5.0)
= 10-5 M
(iii) pH of tomato juice = 4.2
Since, pH = –log [H+]
4.2 = –log [H+]
log [H+] = –4.2
[H+] = anitlog(–4.2)
`= 6.31 xx 10^(-5)`M
iv) pH of lemon juice = 2.2
Since, pH = –log [H+]
2.2 = –log [H+]
log [H+] = –2.2
[H+] = anitlog(–2.2)
`= 6.31 xx 10^(-3)`M
(v) pH of egg white = 7.8
Since, pH = –log [H+]
7.8 = –log [H+]
log [H+] = –7.8
[H+] = anitlog(–7.8)
`= 1.58 xx 10^(-8)`M
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