The dissociation constant of weak acid HA is 4.9×10–8. After making the necessary approximations . Calculate pH in 0.1 M acid
1.15
2.15
3.15
4.15
For weak acid Ka = α2.C
α = =
= 7 × 10–4
pH = –log H+ = –log αC
= – log 7 ×10–4 ×10–1
= 4.1549 = 4.155
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