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pH larutan asam asetat  2,5 M adalah ... (Diketahui )

Pertanyaan

pH larutan asam asetat C H subscript 3 C O O H 2,5 M adalah ... (Diketahui K subscript a space C H subscript 3 C O O H equals 1 cross times 10 to the power of negative sign 5 end exponent)space

Pembahasan Soal:

Asam asetat atau C H subscript 3 C O O H merupakan senyawa asam lemah, maka nilai pH-nya dapat dihitung dengan cara berikut.space


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 square root of K subscript a cross times M end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of 1 middle dot 10 to the power of negative sign 5 end exponent cross times 2 comma 5 end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of 25 cross times 10 to the power of negative sign 6 end exponent end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 5 cross times 10 to the power of negative sign 3 end exponent end cell row blank blank blank row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row pH equals cell negative sign log space 5 cross times 10 to the power of negative sign 3 end exponent end cell row pH equals cell 3 minus sign log space 5 end cell end table 


Jadi, pH larutan asam asetat tersebut adalah 3 - log 5.space

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 26 April 2021

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