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Hitunglah pH HCN 0,049 M. Jika diketahui

Pertanyaan

Hitunglah pH HCN 0,049 M. Jika diketahui begin mathsize 14px style K subscript a equals 4 comma 0 cross times 10 to the power of negative sign 10 end exponent space end style

Pembahasan Soal:

Diketahui:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell M space H C N space end cell equals cell space 0 comma 049 space M space equals space 4 comma 9 cross times 10 to the power of negative sign 2 end exponent space M end cell row cell K subscript a space end subscript H C N space end cell equals cell 4 comma 0 cross times 10 to the power of negative sign 10 end exponent space end cell end table end style

Ditanya:

pH = ...

Penyelesaian:

HCN merupakan suatu asam lemah. Penentuan pH larutan HCN dapat dilakukan dengan cara sebagai berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of K subscript a middle dot M end root end cell row cell space space space space space space space space end cell equals cell square root of 4 comma 0 cross times 10 to the power of negative sign 10 end exponent middle dot 4 comma 9 cross times 10 to the power of negative sign 2 end exponent end root end cell row blank equals cell square root of 19 comma 6 cross times 10 to the power of negative sign 12 end exponent end root end cell row cell space space space space space space space space end cell equals cell space 4 comma 4 cross times 10 to the power of negative sign 6 end exponent end cell row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row cell space space space space space end cell equals cell negative sign log space 4 comma 4 cross times 10 to the power of negative sign 6 end exponent end cell row cell space space space space space end cell equals cell 6 minus sign log space 4 comma 4 space end cell end table end style


Jadi, pH HCN adalah 6 - log 4,4.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 April 2021

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