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pH dari larutan begin mathsize 14px style C H subscript 3 C O O H end style 0,005 M adalah 3, maka nilai begin mathsize 14px style K subscript a end style dari asam tersebut ....begin mathsize 14px style space end style 

  1. ...begin mathsize 14px style space end style 

  2. ...begin mathsize 14px style space end style 

N. Puspita

Master Teacher

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Pembahasan

pH = 3, berarti begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 3 end exponent 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 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 left parenthesis 5 cross times 10 to the power of negative sign 3 end exponent right parenthesis end root end cell row cell left parenthesis 10 to the power of negative sign 3 end exponent right parenthesis squared end cell equals cell K subscript a end subscript cross times left parenthesis 5 cross times 10 to the power of negative sign 3 end exponent right parenthesis 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 5 cross times 10 to the power of negative sign 3 end exponent end fraction end cell row blank equals cell 2 cross times 10 to the power of negative sign 4 end exponent end cell end table end style 


Jadi, begin mathsize 14px style K subscript italic a end style dari senyawa tersebut adalah begin mathsize 14px style bold 2 bold cross times bold 10 to the power of bold minus sign bold 4 end exponent end style.

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