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Tentukan pH larutan  yang terhidrolisis sebagian d...

Tentukan pH larutan begin mathsize 14px style open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 space 0 comma 01 space M end style yang terhidrolisis sebagian dalam air (begin mathsize 14px style Kb equals space 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end style)

Jawaban:

Konsentrasi ion begin mathsize 14px style N H subscript 4 to the power of plus end style pada begin mathsize 14px style open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript end style 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 begin inline style Kw over Kb end style cross times open square brackets G close square brackets end root end cell row blank equals cell square root of begin inline style fraction numerator 10 to the power of negative sign 14 end exponent over denominator 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end fraction cross times 2 cross times 10 to the power of negative sign 2 end exponent end style end root end cell row blank equals cell square root of 11 comma 11 cross times 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 3 comma 33 cross times 10 to the power of negative sign 5 end exponent space M 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 33 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 33 end cell end table end style


Jadi, pH larutan adalah 5-log 3,33.

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