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Berapakah pH larutan  jika diketahui  dan ?

Berapakah pH larutan begin mathsize 14px style 0 comma 01 space M space H subscript 2 S end style jika diketahui begin mathsize 14px style Ka subscript 1 equals space 9 comma 1 cross times 10 to the power of negative sign 8 end exponent end style dan begin mathsize 14px style Ka subscript 2 equals space 1 comma 2 cross times 10 to the power of negative sign 15 end exponent end style?

Jawaban:

Jika terdapat begin mathsize 14px style Ka subscript 1 end style dan begin mathsize 14px style Ka subscript 2 end style, maka yang digunakan adalah begin mathsize 14px style Ka subscript 1 end style. Nilai dari begin mathsize 14px style Ka subscript 2 end style terlalu kecil sehingga bisa diabaikan.

Perhitungan untuk undefined untuk asam lemah adalah:


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 Ka cross times M end root end cell row blank equals cell square root of 9 comma 1 cross times 10 to the power of negative sign 8 end exponent cross times 10 to the power of negative sign 2 end exponent end root end cell row blank equals cell square root of 9 comma 1 cross times 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 3 comma 02 cross times 10 to the power of negative sign 5 end exponent end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space 3 comma 02 cross times 10 to the power of negative sign 5 end exponent end cell row blank equals cell 5 minus sign log space 3 comma 02 end cell end table end style


Jadi, nilai pH adalah begin mathsize 14px style 5 minus sign log space 3 comma 02 end style.

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