1.

Explain concentration of HA, CH_3COO^(-) , H^(+),Na^(+) when 0.05 M sodium acetate is added in 0.05 M acetic acid.

Answer»

Solution :`{:(CH_3COOH hArr , CH_3COO^(-)+,H^(+)),((0.05-x)M,x M, x M),(CH_3COONa to , CH_3COO^(-) + , Na^+),((0.05),0.05 M,0.05 M):}`
Thus, in MIX solution
`[CH_3COOH]`=INITIAL concentration is 0.05 M is less equal to x
`x lt lt 0.05 [CH_3COOH] APPROX` 0.05
in solution `CH_3COO^(-)`=0.05 + x`approx` 0.05 M
in solution `[H^+]`= x M and `[Na^+]`=0.05 M
Due to common ion effect of `CH_3COO^-`
ionization of `CH_3COOH` is less, `[H^+]`=x decrease and pH INCREASE .
`[CH_3COO^-]` increase than pH increase.


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