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Larutan suatu asam lemah HA 0,1 M mempunyai pH 3, maka nilai  asam HA tersebut adalah ...

Pertanyaan

Larutan suatu asam lemah HA 0,1 M mempunyai pH 3, maka nilai K subscript a asam HA tersebut adalah ...

  1. 10 to the power of negative sign 2 end exponent 

  2. 10 to the power of negative sign 4 end exponent 

  3. 10 to the power of negative sign 3 end exponent 

  4. 10 to the power of negative sign 5 end exponent 

  5. 10 to the power of negative sign 6 end exponent 

Pembahasan Soal:

Larutan asam lemah HA 0,1 M mempunyai pH 3, maka nilai K subscript a asam HA:

table attributes columnalign right center left columnspacing 0px end attributes row cell italic p H end cell equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row 3 equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row cell negative sign log space 10 to the power of negative sign 3 end exponent end cell equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 3 end exponent end cell end table 

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 10 to the power of negative sign 3 end exponent end cell equals cell square root of K subscript a cross times 0 comma 1 end root end cell row cell open parentheses 10 to the power of negative sign 3 end exponent close parentheses squared end cell equals cell K subscript a cross times 0 comma 1 end cell row cell K subscript a end cell equals cell fraction numerator 10 to the power of negative sign 6 end exponent over denominator 0 comma 1 end fraction end cell row blank equals cell 10 to the power of negative sign 5 end exponent end cell end table 

Oleh karena itu, nilai K subscript a asam HA adalah 10 to the power of negative sign 5 end exponent.

Jadi, jawaban yang benar adalah D.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 10 Juni 2021

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