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Suatu larutan terdiri dari campuran antara 50 ml  ...

Suatu larutan terdiri dari campuran antara 50 ml begin mathsize 14px style C H subscript 3 C O O H end style 0,2 M dan 50 ml larutan begin mathsize 14px style C H subscript 3 C O O Na end style 0,1 M. Larutan tersebut memiliki pH sebesar. begin mathsize 14px style open parentheses K subscript a C H subscript 3 C O O H equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent close parentheses end style 

  1. 5 - log 1,8. 

  2. 5 - log 3,6. 

  3. 5 - log 9. 

  4. 6 - log 1,8. 

  5. 6 - log 3,6. 

Jawaban:

begin mathsize 14px style n subscript C H subscript 3 C O O H end subscript equals 0 comma 2 cross times 50 equals 10 space mmol n subscript C H subscript 3 C O O to the power of minus sign end subscript equals 0 comma 1 cross times 50 equals 5 space mmol open square brackets H to the power of plus sign close square brackets equals K subscript italic a fraction numerator open square brackets C H subscript 3 C O O H close square brackets over denominator open square brackets C H subscript 3 C O O to the power of minus sign close square brackets end fraction open square brackets H to the power of plus sign close square brackets equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent fraction numerator bevelled 10 over 100 over denominator bevelled 5 over 100 end fraction open square brackets H to the power of plus sign close square brackets equals 3 comma 6 cross times 10 to the power of negative sign 5 end exponent space M  pH equals 5 minus sign log space 3 comma 6 end style


Dengan demikian, maka jawaban yang tepat adalah B.

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