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Terdapat 100 mL larutan  0,1 M yang memiliki . Mak...

Terdapat 100 mL larutan begin mathsize 14px style C H subscript 3 C O O H end style 0,1 M yang memiliki begin mathsize 14px style K subscript a equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end style. Maka nilai begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style dan begin mathsize 14px style alpha end style adalah ....

  1. begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 3 space end exponent M end style dan begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 2 space end exponent M end style 

  2. begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 2 space end exponent M end style dan begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 3 space end exponent M end style 

  3. begin mathsize 14px style 1 comma 43 cross times 10 to the power of negative sign 3 space end exponent M end style dan begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 2 space end exponent M end style 

  4. begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 3 space end exponent M end style dan begin mathsize 14px style 1 comma 43 cross times 10 to the power of negative sign 2 space end exponent M end style 

  5. begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 3 space end exponent M end style dan begin mathsize 14px style 1 comma 34 cross times 10 to the power of negative sign 3 space end exponent M end style 

Jawaban:

Larutan begin mathsize 14px style C H subscript 3 C O O H end style merupakan asam lemah, maka konsentrasi ion begin mathsize 14px style H to the power of plus sign end style -nya dapat ditentukan dari:

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 subscript a end root end cell row blank equals cell square root of 1 comma 8 cross times 10 to the power of negative sign 5 end exponent cross times 0 comma 1 end root end cell row blank equals cell square root of 1 comma 8 cross times 10 to the power of negative sign 6 end exponent end root end cell row blank equals cell 1 comma 34 cross times 10 to the power of negative sign 3 end exponent end cell end table end style 

begin mathsize 14px style alpha end style merupakan derajat disosiasi, dapat dicari dengan:

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 alpha cross times M subscript a end cell row cell 1 comma 34 cross times 10 to the power of negative sign 3 end exponent end cell equals cell alpha cross times 0 comma 1 end cell row alpha equals cell 1 comma 34 cross times 10 to the power of negative sign 2 end exponent end cell end table end style  

Jadi, jawaban yang benar adalah A.

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