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Asam fosfat  merupakan asam poliprotik dengan nila...

Asam fosfat begin mathsize 14px style open parentheses H subscript 3 P O subscript 4 close parentheses end style merupakan asam poliprotik dengan nilai begin mathsize 14px style K subscript a subscript 1 end subscript equals 7 comma 5 cross times 10 to the power of negative sign 3 end exponent end style ; begin mathsize 14px style K subscript a subscript 2 end subscript equals 6 comma 2 cross times 10 to the power of negative sign 8 end exponent end style ; dan begin mathsize 14px style K subscript a subscript 3 end subscript equals 4 comma 8 cross times 10 to the power of negative sign 13 end exponent end style, nilai pH larutan begin mathsize 14px style H subscript 3 P O subscript 4 end style 0,1 M adalah .... (log 2,7 = 0,4)

  1. 1,0undefined 

  2. 1,6undefined 

  3. 2,6undefined 

  4. 2,6undefined 

  5. 3,3undefined 

Jawaban:

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 blank equals cell square root of 7 comma 5 cross times 10 to the power of negative sign 3 end exponent cross times 10 to the power of negative sign 1 end exponent end root end cell row blank equals cell 2 comma 7 cross times 10 to the power of negative sign 2 end exponent end cell row pH equals cell negative sign log open parentheses 2 comma 7 cross times 10 to the power of negative sign 2 end exponent close parentheses end cell row blank equals cell 2 minus sign log open parentheses 2 comma 7 close parentheses end cell row blank equals cell 2 minus sign 0 comma 4 end cell row blank equals cell 1 comma 6 end cell end table end style 


Jadi, jawaban yang tepat adalah B. 

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