Untuk menentukan % asam cuka dilakukan dengan titrasi 2 ml larutan asam cuka dan memerlukan 35 ml larutan 0,1M. Massa jenis larutan . Berapa % kadar asam cuka tersebut?

Pertanyaan

Untuk menentukan % asam cuka dilakukan dengan titrasi 2 ml larutan asam cuka dan memerlukan 35 ml larutan $begin mathsize 14px style Na O H end style$ 0,1M. Massa jenis larutan $begin mathsize 14px style 950 space gram space liter to the power of negative sign 1 end exponent end style$ . Berapa % kadar asam cuka tersebut?

$begin mathsize 14px style 9 percent sign end style$ $space$
$begin mathsize 14px style 8 comma 5 space percent sign end style$ $space$
$begin mathsize 14px style 11 comma 05 percent sign end style$ $space$
$begin mathsize 14px style 15 percent sign end style$ $space$
$begin mathsize 14px style 25 percent sign end style$ $space$

Pembahasan Soal:

Mencari molaritas $begin mathsize 14px style C H subscript bold 3 C O O H end style$

$begin mathsize 14px style C H subscript 3 C O O H space dan space Na O H end style$ adalah asam lemah dan basa kuat bervalensi 1 oleh karena itu:

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell a cross times V subscript 1 cross times M subscript 1 end cell equals cell b cross times V subscript 2 cross times M subscript 2 end cell row cell a cross times V space C H subscript 3 C O O H cross times M space C H subscript 3 C O O H end cell equals cell b cross times V space Na O H cross times M space Na O H end cell row cell 1 cross times 2 space mL cross times M space C H subscript 3 C O O H end cell equals cell 1 cross times 35 space mL cross times 0 comma 1 space M end cell row cell M space C H subscript 3 C O O H end cell equals cell 1 comma 75 space M end cell end table end style$

Mencari massa $begin mathsize 14px style C H subscript bold 3 C O O H end style$

$begin mathsize 14px style mol space C H subscript 3 C O O H double bond V space C H subscript 3 C O O H cross times space M space C H subscript 3 C O O H mol space C H subscript 3 C O O H equals 2 space mL cross times 1 comma 75 space M mol space C H subscript 3 C O O H equals 3 comma 5 space mmol mol space C H 3 C O O H equals fraction numerator massa space C H subscript 3 C O O H over denominator M subscript r space C H subscript 3 C O O H end fraction massa space C H subscript 3 C O O H double bond mol space C H subscript 3 C O O H cross times M subscript r space C H subscript 3 C O O H massa space C H subscript 3 C O O H equals 3 comma 5 cross times 10 to the power of negative sign 3 end exponent space mol cross times 60 space g space mol to the power of negative sign 1 end exponent massa space C H subscript 3 C O O H equals 0 comma 21 space gram end style$

Mencari massa larutan $begin mathsize 14px style C H subscript bold 3 C O O H end style$

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell rho space C H subscript 3 C O O H end cell equals cell 950 space gram space dalam space 1000 space mL end cell row cell massa space larutan space 2 space mL space C H subscript 3 C O O H end cell equals cell fraction numerator 2 space mL over denominator 1000 space mL end fraction cross times 950 space gram end cell row cell massa space larutan space 2 space mL space C H subscript 3 C O O H end cell equals cell 1 comma 9 space gram end cell row blank blank blank end table end style$

Mencari kadar $Error converting from MathML to accessible text.$

$Kadar space C H subscript size 14px 3 C O O H size 14px equals fraction numerator size 14px massa size 14px space size 14px space C H subscript size 14px 3 C O O H size 14px space over denominator size 14px massa size 14px space size 14px larutan size 14px space size 14px space C H subscript size 14px 3 C O O H end fraction size 14px cross times size 14px 100 size 14px percent sign size 14px Kadar size 14px space C H subscript size 14px 3 C O O H size 14px equals fraction numerator size 14px 0 size 14px comma size 14px 21 size 14px space size 14px gram over denominator size 14px 1 size 14px comma size 14px 9 size 14px space size 14px gram end fraction size 14px cross times size 14px 100 size 14px percent sign size 14px Kadar size 14px space C H subscript size 14px 3 C O O H size 14px equals size 14px 11 size 14px comma size 14px 05 size 14px percent sign$

Jadi kadar asam cuka adalah 11,05%.

Oleh karena itu, jawaban yang benar adalah C. $space$

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 12 April 2021

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