Roboguru

Hitunglah pH larutan  0,1 M jika diketahui .

Pertanyaan

Hitunglah pH larutan C H subscript 3 C O O Na 0,1 M jika diketahui K subscript a space C H subscript 3 C O O H equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent.

Pembahasan Soal:

Larutan C H subscript 3 C O O Na merupakan garam yang bersifat basa, sehingga:

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 w over K subscript a cross times M end root end cell row blank equals cell square root of 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 0 comma 1 end root end cell row blank equals cell square root of 0 comma 5 cross times 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 0 comma 71 cross times 10 to the power of negative sign 5 end exponent space M end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell italic p O H end cell 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 0 comma 71 cross times 10 to the power of negative sign 5 end exponent end cell row blank equals cell 5 minus sign log space 0 comma 71 end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell italic p H end cell equals cell 14 minus sign italic p O H end cell row blank equals cell 14 minus sign left parenthesis 5 minus sign log space 0 comma 71 right parenthesis end cell row blank equals cell 9 plus log space 0 comma 71 end cell row blank equals cell 8 comma 9 end cell end table 

Oleh karena itu, pH larutan C H subscript 3 C O O Na adalah 8,9.

Jadi, jawaban yang benar pH larutan C H subscript bold 3 C O O Na adalah 8,9.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 10 Juni 2021

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