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Tentukan besarnya pH larutan berikut! 0,1 M

Tentukan besarnya pH larutan berikut!
0,1 M begin mathsize 14px style H subscript 2 C O subscript 3 space left parenthesis K subscript a equals 4 comma 8 middle dot 10 to the power of negative sign 11 end exponent right parenthesis end style 

Jawaban:

pH larutan begin mathsize 14px style H subscript 2 C O subscript 3 end style dapat dihitung dengan rumus asam lemah sebagai berikut:

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 cross times M end root end cell row blank equals cell square root of left parenthesis 4 comma 8 cross times 10 to the power of negative sign 11 end exponent right parenthesis cross times 0 comma 1 end root end cell row blank equals cell square root of 4 comma 8 cross times 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell 2 comma 2 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 pH equals cell negative sign log left parenthesis 2 comma 2 cross times 10 to the power of negative sign 6 end exponent right parenthesis end cell row blank equals cell 6 minus sign log space 2 comma 2 end cell row blank equals cell 5 comma 7 end cell end table    

Jadi, pH larutan tersebut adalah 5,7.

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