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Ke dalam 40 mL larutan ditambahkan 100 mL larutan HCl 0,02 M, maka pH campuran adalah ...

Ke dalam 40 mL larutan begin mathsize 14px style N H subscript 3 space 0 comma 2 space M space left parenthesis K subscript b equals 10 to the power of negative sign 5 end exponent right parenthesis end style ditambahkan 100 mL larutan HCl 0,02 M, maka pH campuran adalah ...

  1. 5-log 3. 

  2. 9+log 3. 

  3. 3-log 5. 

  4. 3+log 5. 

  5. 9-log 3. 

Jawaban:

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals K subscript italic b cross times fraction numerator open square brackets N H subscript 3 close square brackets over denominator open square brackets N H subscript 4 to the power of plus close square brackets end fraction open square brackets O H to the power of minus sign close square brackets equals 10 to the power of negative sign 5 end exponent cross times fraction numerator bevelled 6 over 140 over denominator bevelled 2 over 140 end fraction open square brackets O H to the power of minus sign close square brackets equals 3 cross times 10 to the power of negative sign 5 end exponent space M  pOH equals minus sign log open square brackets O H to the power of minus sign close square brackets pOH equals minus sign log space left parenthesis 3 cross times 10 to the power of negative sign 5 end exponent right parenthesis pOH equals 5 minus sign log space 3  pH equals 14 minus sign left parenthesis 5 minus sign log space 3 right parenthesis pH equals 9 plus log space 3 end style
 

Dengan demikian, maka jawaban yang tepat adalah B.

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