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Di dalam 250 mL larutan terdapat 8,2 gram () dan 0,1 mol (). pH larutan tersebut adalah ....

Di dalam 250 mL larutan terdapat 8,2 gram begin mathsize 14px style C H subscript 3 C O O Na end style (begin mathsize 14px style M subscript r equals 82 end style) dan 0,1 mol begin mathsize 14px style C H subscript 3 C O O H end style (begin mathsize 14px style K subscript a equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end style). pH larutan tersebut adalah ....begin mathsize 14px style space end style 

  1. 5 - log 1,8begin mathsize 14px style space end style 

  2. 5begin mathsize 14px style space end style 

  3. 5 + log 1,8begin mathsize 14px style space end style 

  4. 9 + log 1,8begin mathsize 14px style space end style 

  5. 11begin mathsize 14px style space end style 

Jawaban:

Campuran begin mathsize 14px style C H subscript 3 C O O Na end style dan undefined akan membentuk larutan penyangga asam.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n space C H subscript 3 C O O Na end cell equals cell m over M subscript r end cell row blank equals cell fraction numerator 8 comma 2 space g over denominator 82 space g forward slash mol end fraction end cell row blank equals cell 0 comma 1 space mol 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 H to the power of plus sign close square brackets end cell equals cell K subscript a cross times fraction numerator n space C H subscript 3 C O O H over denominator n space C H subscript 3 C O O Na end fraction end cell row blank equals cell 1 comma 8 cross times 10 to the power of negative sign 5 end exponent cross times fraction numerator 0 comma 1 space mol over denominator 0 comma 1 space mol end fraction end cell row blank equals cell 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end cell end table end style  

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space left parenthesis 1 comma 8 cross times 10 to the power of negative sign 5 end exponent right parenthesis end cell row blank equals cell 5 minus sign log space 1 comma 8 end cell end table end style 


Jadi, jawaban yang tepat adalah A.

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