The Total solution for NCERT class 6-12
ThepH 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 ionconcentration in each.
Thehydrogen ion concentration in the given substances can be calculated by usingthe 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)
(ii)pH of black coffee = 5.0
5.0 = –log [H+]
log [H+] = –5.0
[H+] = anitlog(–5.0)
(iii)pH of tomato juice = 4.2
4.2 = –log [H+]
log [H+] = –4.2
[H+] = anitlog(–4.2)
(iv)pH of lemon juice = 2.2
2.2 = –log [H+]
log [H+] = –2.2
[H+] = anitlog(–2.2)
(v)pH of egg white = 7.8
7.8 = –log [H+]
log [H+] = –7.8
[H+] = anitlog(–7.8)