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Bila diketahui pH larutan  adalah 4, hitunglah pH ...

Bila diketahui pH larutan begin mathsize 14px style H C N space 0 comma 1 space M end style adalah 4, hitunglah pH larutan begin mathsize 14px style Na C N end style begin mathsize 14px style 4 cross times 10 to the power of negative sign 3 end exponent space M end style.undefined  

Jawaban:

begin mathsize 14px style pH equals 4 comma space berarti space open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 4 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 space H C N end root end cell row cell 10 to the power of negative sign 4 end exponent end cell equals cell square root of K subscript a cross times 0 comma 1 end root end cell row cell left parenthesis 10 to the power of negative sign 4 end exponent right parenthesis squared end cell equals cell K subscript a end subscript cross times 0 comma 1 end cell row cell 10 to the power of negative sign 8 end exponent 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 8 end exponent over denominator 0 comma 1 end fraction end cell row cell K subscript a end cell equals cell 10 to the power of negative sign 7 end exponent end cell end table end style 

 

Garam undefined merupakan garam basa.


begin mathsize 14px style 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 K subscript w over K subscript a cross times M space Na C N end root end cell row blank equals cell square root of 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 7 end exponent cross times 4 cross times 10 to the power of negative sign 3 end exponent 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 end cell end table end style 


begin mathsize 14px style 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 left parenthesis 2 cross times 10 to the power of negative sign 5 end exponent right parenthesis end cell row blank equals cell 5 minus sign log space 2 end cell end table end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 5 minus sign log space 2 right parenthesis end cell row blank equals cell 9 plus log space 2 end cell end table end style 


Jadi, pH larutan tersebut adalah 9 + log 2.

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