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Tentukan pH larutan yang terjadi jika 50 ml laruta...

Tentukan pH larutan yang terjadi jika 50 ml larutan HCOOH 0,4 M dicampur dengan 50 ml larutan HCOONa 0,2 M (Ka=10-6)

Jawaban:

Campuran HCOOH dan HCOONa membentuk larutan penyangga. 

begin mathsize 14px style Mol space H C O O H space open parentheses asam close parentheses space equals space 0 comma 4 space M space x space 0 comma 05 space L Mol space H C O O H space open parentheses asam close parentheses space equals space 2 space x space 10 to the power of negative sign 2 end exponent space mol  Mol space H C O O Na space left parenthesis basa space konjugasi right parenthesis space equals space 0 comma 2 space M space x space 0 comma 05 space L Mol space H C O O Na space left parenthesis basa space konjugasi right parenthesis space equals space 1 space x space 10 to the power of negative sign 2 end exponent space mol end style 

Mencari ion H+ dalam larutan penyangga menggunakan persamaan:

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets space equals space K subscript a space x space fraction numerator mol space asam over denominator mol space basa space konjugasi end fraction open square brackets H to the power of plus sign close square brackets space equals space 10 to the power of negative sign 6 end exponent space x space fraction numerator 2 space x 10 to the power of negative sign 2 end exponent over denominator 1 space x space 10 to the power of negative sign 2 end exponent end fraction open square brackets H to the power of plus sign close square brackets space equals space 2 space x space 10 to the power of negative sign 6 end exponent space  pH space equals space minus sign space log space open square brackets H to the power of plus sign close square brackets pH space equals space minus sign space log space 2 space x space 10 to the power of negative sign 6 end exponent pH space equals space 6 space minus sign space log space 2 end style 

Jadi, pH larutan yang terjadi adalah 6 - log 2.

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