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Sebanyak 50 mL larutan  0,1 M dicampur dengan 50 m...

Sebanyak 50 mL larutan begin mathsize 14px style H Cl end style 0,1 M dicampur dengan 50 mL larutan begin mathsize 14px style N H subscript 4 O H end style 0,1 M. Jika begin mathsize 14px style K subscript b space N H subscript 4 O H equals 5 cross times 10 to the power of negative sign 5 end exponent end style, maka pH campuran yaitu ....undefined 

  1. 4,0undefined 

  2. 5,0undefined 

  3. 5,5undefined 

  4. 6,0undefined 

  5. 7,0undefined 

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n space H Cl end cell equals cell V cross times M end cell row blank equals cell 50 space mL cross times 0 comma 1 space M end cell row blank equals cell 5 space mmol end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n space N H subscript 4 O H end cell equals cell V cross times M end cell row blank equals cell 50 space mL cross times 0 comma 1 space M end cell row blank equals cell 5 space mmol end cell end table end style 

Campuran tersebut membentuk garam asam yang terhidrolisis.

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 w over K subscript b cross times fraction numerator n space N H subscript 4 Cl over denominator V space total end fraction end root end cell row blank equals cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 5 cross times 10 to the power of negative sign 5 end exponent end fraction cross times fraction numerator 5 space mmol over denominator 100 space mL end fraction end root end cell row blank equals cell square root of 10 to the power of negative sign 11 end exponent end root end cell row blank equals cell 10 to the power of negative sign 5 comma 5 end exponent end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space left parenthesis 10 to the power of negative sign 5 comma 5 end exponent right parenthesis end cell row blank equals cell 5 comma 5 end cell end table end style 


Jadi, jawaban yang tepat adalah C.

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