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Tentukan massa asam asetat yang diperlukan untuk m...

Tentukan massa asam asetat yang diperlukan untuk membuat 100 mL larutan asam asetat dengan pH= 1. (Ar undefined= 12, begin mathsize 14px style H end style= 1, begin mathsize 14px style O end style= 16, dan Ka= begin mathsize 14px style 2 cross times 10 to the power of negative sign 4 end exponent end style)

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals 1 row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 1 end exponent end cell end table end style


Karena asam asetat tergolong ke asam lemah, maka rumus begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style yang digunakan 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 Ka cross times M end root end cell row cell open parentheses 10 to the power of negative sign 1 end exponent close parentheses squared end cell equals cell open parentheses square root of 2 cross times 10 to the power of negative sign 4 end exponent cross times M end root close parentheses squared end cell row cell 10 to the power of negative sign 2 end exponent end cell equals cell 2 cross times 10 to the power of negative sign 4 end exponent cross times M end cell row M equals cell begin inline style fraction numerator 10 to the power of negative sign 2 end exponent over denominator 2 cross times 10 to the power of negative sign 4 end exponent end fraction end style end cell row blank equals cell 50 space M end cell end table end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Mr space C H subscript 3 C O O H end cell equals cell 2 left parenthesis 12 right parenthesis plus 2 left parenthesis 16 right parenthesis plus 4 left parenthesis 1 right parenthesis end cell row blank equals 60 end table end style
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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 H 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 open parentheses mL close parentheses end fraction end style end cell row cell 50 space M end cell equals cell begin inline style m over 60 end style cross times begin inline style 1000 over 100 end style end cell row m equals cell 300 space gram end cell end table end style


Jadi, massa asam asetat yang diperlukan adalah 300 gram.

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