Pertanyaan

Hitunglah pH larutan CH 3 COONa 0,008 M sebanyak 100 mL. Jika K a CH 3 COOH = 2 × 1 0 − 5 .

Hitunglah pH larutan $CH_{3} COONa$ 0,008 M sebanyak 100 mL. Jika $K_{a} CH_{3} COOH = 2 \times 1 0^{- 5}$ .

N. Puspita

Master Teacher

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Jawaban

pH larutan tersebut adalah 8 + log 2.

Pembahasan

Garam merupakan garam basa. Jadi, pH larutan tersebut adalah 8 + log 2.

Garam merupakan garam basa.

C H subscript 3 C O O Na space yields C H subscript 3 C O O to the power of minus sign plus space Na to the power of plus sign 8 space cross times space 10 to the power of negative sign 3 end exponent space space space space space space space space space space 8 space cross times space 10 to the power of negative sign 3 end exponent space

$table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets O H to the power of minus sign close square brackets end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of K subscript w over K subscript a cross times open square brackets C H subscript 3 C O O to the power of minus sign close square brackets end root end cell end table space space space space space space space space space table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction cross times 8 cross times 10 to the power of negative sign 3 end exponent end root end cell end table space space space space space space space space space table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 4 cross times 10 to the power of negative sign 12 end exponent end root end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table space space space space space space space space space table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 6 end exponent end cell end table space table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell space space end cell end table$

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 6 minus sign log space 2 right parenthesis end cell row blank equals cell 8 plus log space 2 end cell end table end style

Jadi, pH larutan tersebut adalah 8 + log 2.

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