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Hitunglah konsentrasi ion H + dan ion OH − dalam larutan HBrO 0,1 M ( K a ​ = 4 × 1 0 − 9 )

Hitunglah konsentrasi ion dan ion dalam larutan HBrO 0,1 M  

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N. Puspita

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merupakan asam lemahbervalensi satu, sehingga perhitungan ion dapat dilakukan dengan cara di bawah ini. Selanjutnya konsentrasi dapat dihitung menggunakan persamaan di bawah ini. Jadi, konsentrasi ion larutan berturut-turut adalah .

begin mathsize 14px style H Br O end style merupakan asam lemah bervalensi satu, sehingga perhitungan ion begin mathsize 14px style H to the power of plus sign end style dapat dilakukan dengan cara di bawah ini.

begin mathsize 14px style 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 4 cross times 10 to the power of negative sign 9 end exponent cross times 0 comma 1 end root end cell row blank equals cell square root of 4 cross times 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 2 cross times 10 to the power of negative sign 5 end exponent space M end cell end table end style  

Selanjutnya konsentrasi begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style dapat dihitung menggunakan persamaan di bawah ini.

begin mathsize 14px style H subscript 2 O space left parenthesis italic l right parenthesis yields H to the power of plus sign left parenthesis italic a italic q right parenthesis plus O H to the power of minus sign left parenthesis italic a italic q right parenthesis end style 

begin mathsize 14px style K subscript w double bond open square brackets H to the power of plus sign close square brackets open square brackets O H to the power of minus sign close square brackets end style   

begin mathsize 14px style 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 cross times open square brackets O H to the power of minus sign close square brackets end cell equals cell 10 to the power of negative sign 14 end exponent end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell fraction numerator 10 to the power of negative sign 14 end exponent over denominator open square brackets H to the power of plus sign close square brackets end fraction end cell row blank equals cell fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction end cell row blank equals cell 5 cross times 10 to the power of negative sign 10 end exponent space M end cell end table end style 

Jadi, konsentrasi ion begin mathsize 14px style O H to the power of minus sign dan space H to the power of plus sign end style larutan begin mathsize 14px style N H subscript 3 space 0 comma 1 space M end style berturut-turut adalah begin mathsize 14px style 5 cross times 10 to the power of negative sign 10 end exponent space M space dan space 2 cross times 10 to the power of negative sign 5 end exponent space M end style.

 

 

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