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Hitunglah pH larutan:  1 M (Ka = )

Pertanyaan

Hitunglah pH larutan:


C H subscript 3 C O O Na 1 M (Ka C H subscript 3 C O O H1 cross times 10 to the power of negative sign 5 end exponent)

Pembahasan Soal:

C H subscript 3 C O O Na adalah garam basa yang mengalami hidrolisis parsial. Ion yang mengalami hidrolisis pada C H subscript 3 C O O Na adalah ion C H subscript 3 C O O to the power of minus sign yang berasal dari asam lemah.


C H subscript 3 C O O Na yields C H subscript 3 C O O to the power of minus sign and Na to the power of plus sign

Koefisien C H subscript 3 C O O to the power of minus sign sama dengan koefisien C H subscript 3 C O O Na maka konsentrasi C H subscript 3 C O O to the power of minus sign adalah 1 M.


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 begin inline style Kw over Ka end style cross times M end root end cell row blank equals cell square root of begin inline style fraction numerator 10 to the power of negative sign 14 end exponent over denominator 1 cross times 10 to the power of negative sign 5 end exponent end fraction end style cross times 1 end root end cell row blank equals cell square root of 10 to the power of negative sign 9 end exponent end root end cell row blank equals cell 10 to the power of negative sign 4 comma 5 end exponent end cell end table


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 10 to the power of negative sign 4 comma 5 end exponent end cell row blank equals cell 4 comma 5 end cell row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign 4 comma 5 end cell row blank equals cell 9 comma 5 end cell end table


Jadi, pH larutan adalah 9,5.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 06 Mei 2021

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