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Hitung pH larutan 25 ml larutan NH3​ 0,005 M (Kb​=1,8×10−5) .

Pertanyaan

Hitung pH larutan 25 ml larutan N H subscript 3 space 0 comma 005 space M space left parenthesis K subscript b equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent right parenthesis space.

I. Solichah

Master Teacher

Jawaban terverifikasi

Jawaban

 pH larutan N H subscript 3 adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 10 plus log space 3 end cell end table.

Pembahasan

Larutan N H subscript 3 termasuk senyawa basa lemah dengan nilai K subscript b equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent. pH dari larutan N H subscript 3 0,005 M dapat dihitung dengan cara sebagai berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of K subscript b italic cross times M end root end cell row blank equals cell square root of 1 comma 8 cross times 10 to the power of negative sign 5 end exponent cross times 0 comma 005 end root end cell row blank equals cell square root of 0.009 cross times 10 to the power of negative sign 5 end exponent end root end cell row blank equals cell square root of 9 cross times 10 to the power of negative sign 8 end exponent end root end cell row blank equals cell 3 cross times 10 to the power of negative sign 4 end exponent end cell end table   

Maka pH larutan dapat dihitung sebagai berikut:

table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space open parentheses 3 cross times 10 to the power of negative sign 4 end exponent close parentheses end cell row blank equals cell 4 minus sign log space 3 end cell row cell pH and pOH end cell equals 14 row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign open parentheses 4 minus sign log space 3 close parentheses end cell row blank equals cell 10 plus log space 3 end cell end table 

 Jadi pH larutan N H subscript 3 adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 10 plus log space 3 end cell end table.

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