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Sebanyak 1 L larutan penyangga mengandung 1,0 mol ...

Sebanyak 1 L larutan penyangga mengandung 1,0 mol begin mathsize 14px style C H subscript 3 C O O H end style begin mathsize 14px style left parenthesis K subscript a equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent right parenthesis end style dan 1,0 mol begin mathsize 14px style C H subscript 3 C O O Na end style. Apakah larutan penyangga ini bersifat asam atau basa?

  1. ...space 

  2. ...undefined 

Jawaban:

pH larutan penyangga:

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets double bond K subscript a point fraction numerator n space C H subscript 3 C O O H over denominator n space C H subscript 3 C O O to the power of minus sign end fraction space space space space space equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent cross times fraction numerator 1 comma 0 over denominator 1 comma 0 end fraction space space space space space equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent pH equals minus sign log open square brackets H to the power of plus sign close square brackets space space space space equals minus sign log left parenthesis 1 comma 8 cross times 10 to the power of negative sign 5 end exponent right parenthesis space space space space equals 5 minus sign log space 1 comma 8 space space space space equals 5 minus sign 0 comma 25 space space space space equals 4 comma 75 end style 

pH larutan kurang dari 7, sehingga larutan penyangga bersifat asam.

Jadi, larutan penyangga tersebut bersifat asam.

0

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