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pH dari larutan yang merupakan campuran dari 100 m...

pH dari larutan yang merupakan campuran dari 100 mL begin mathsize 14px style C H subscript 3 C O O H end style 0,2 M dan 100 mL begin mathsize 14px style Na O H end style 0,2 M, jika begin mathsize 14px style K subscript a space C H subscript 3 C O O H equals 10 to the power of negative sign 5 end exponent end style adalah ....undefined  

  1. 9  

  2. 8  

  3. 7  

  4. 10  

  5. 11 

Jawaban:

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 H end cell equals cell V cross times M end cell row blank equals cell 100 space mL cross times 0 comma 2 space M end cell row blank equals cell 20 space mmol end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n space Na O H end cell equals cell V cross times M end cell row blank equals cell 100 space mL cross times 0 comma 2 space M end cell row blank equals cell 20 space mmol end cell end table end style 

 

Campuran tersebut membentuk garam basa yang terhidrolisis.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of K subscript w over K subscript a cross times fraction numerator n space C H subscript 3 C O O Na over denominator V space total end fraction end root end cell row blank equals cell square root of 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent cross times fraction numerator 20 space mmol over denominator 200 space mL end fraction end root end cell row blank equals cell square root of 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 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 pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space left parenthesis 10 to the power of negative sign 5 end exponent right parenthesis end cell row blank equals 5 end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign 5 end cell row blank equals 9 end table end style 


Jadi, jawaban yang tepat adalah A.

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