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Hitunglah pH larutan asam/basa berikut : b.  HCN ...

Hitunglah pH larutan asam/basa berikut :

b.  HCN 0,2 M begin mathsize 14px style left parenthesis Ka equals 5 cross times 10 to the power of negative sign 10 end exponent right parenthesis end style

Jawaban:

HCN merupakan asam lemah sehingga perhitungan pH larutan tersebut dapat menggunakan persamaan di bawah ini.

table attributes columnalign right center left columnspacing 0px end attributes row cell H to the power of plus sign end cell equals cell square root of Ka cross times M end root end cell row blank equals cell square root of 5 cross times 10 to the power of negative sign 10 end exponent cross times 0 comma 2 space M end root end cell row blank equals cell square root of 1 cross times 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 1 cross times 10 to the power of negative sign 5 end exponent end cell row blank blank blank row pH equals cell negative sign log open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space left parenthesis 1 cross times 10 to the power of negative sign 5 end exponent right parenthesis end cell row blank equals 5 end table

Jadi, pH larutan HCN 0,2 M adalah 5.

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