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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? 

  1. begin mathsize 14px style 9 percent sign end stylespace 

  2. begin mathsize 14px style 8 comma 5 space percent sign end stylespace 

  3. begin mathsize 14px style 11 comma 05 percent sign end stylespace 

  4. begin mathsize 14px style 15 percent sign end stylespace 

  5. begin mathsize 14px style 25 percent sign end stylespace 

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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