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Pertanyaan

Sebanyak 4,1 gram garam CH 3 ​ COONa dilarutkan ke dalam air hingga volumenya 250 mL. Jika tetapan hidrolisis garam tersebut 2 ⋅ 1 0 − 8 maka pH larutan sebesar .... (Ar C = 12, O = 16, Na = 23, H = 1).

Sebanyak 4,1 gram garam  dilarutkan ke dalam air hingga volumenya 250 mL. Jika tetapan hidrolisis garam tersebut  maka pH larutan begin mathsize 14px style C H subscript 3 C O O Na end style sebesar .... (Ar = 12, = 16, = 23, = 1).

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pH larutan adalah 9,5+log 2.

pH larutan begin mathsize 14px style C H subscript 3 C O O Na end style adalah 9,5+log 2.

Pembahasan

Jadi, pH larutan adalah 9,5+log 2.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets C H subscript 3 C O O Na close square brackets end cell equals cell begin inline style m over Mr end style cross times begin inline style fraction numerator 1000 over denominator V space open parentheses mL close parentheses end fraction end style end cell row blank equals cell begin inline style fraction numerator 4 comma 1 over denominator 2 left parenthesis 12 right parenthesis plus 3 left parenthesis 1 right parenthesis plus 2 left parenthesis 16 right parenthesis plus 1 left parenthesis 23 right parenthesis end fraction end style cross times begin inline style 1000 over 250 end style end cell row blank equals cell begin inline style fraction numerator 4 comma 1 over denominator 82 end fraction end style cross times 4 end cell row blank equals cell 0 comma 2 space M end cell end table end style


begin mathsize 14px style 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 begin inline style Kw over Ka end style cross times open square brackets C H subscript 3 C O O Na close square brackets end root end cell row blank equals cell square root of Kh cross times open square brackets C H subscript 3 C O O Na close square brackets end root end cell row blank equals cell square root of 2 cross times 10 to the power of negative sign 8 end exponent cross times 2 cross times 10 to the power of negative sign 1 end exponent end root end cell row blank equals cell 2 cross times 10 to the power of negative sign 4 comma 5 end exponent end cell end table end style


begin mathsize 14px style 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 2 cross times 10 to the power of negative sign 4 comma 5 end exponent end cell row blank equals cell 4 comma 5 minus sign log space 2 end cell row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 4 comma 5 minus sign log space 2 right parenthesis end cell row blank equals cell 9 comma 5 plus log space 2 end cell end table end style


Jadi, pH larutan begin mathsize 14px style C H subscript 3 C O O Na end style adalah 9,5+log 2.

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