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Sebanyak 100 mL larutan HCI 0,6 M ditambahkan pada 200 mL larutan 0,6 M menurut reaksi: . Nilai pH larutan yang terjadi adalah ....

Sebanyak 100 mL larutan HCI 0,6 M ditambahkan pada 200 mL larutan begin mathsize 14px style N H subscript 3 end style 0,6 M begin mathsize 14px style open parentheses K subscript b space N H subscript 3 equals 10 to the power of negative sign 5 end exponent comma space K subscript w equals 10 to the power of negative sign 14 end exponent close parentheses end style menurut reaksi: begin mathsize 14px style N H subscript 3 open parentheses aq close parentheses and H Cl open parentheses aq close parentheses yields N H subscript 4 Cl open parentheses aq close parentheses end style. Nilai pH larutan yang terjadi adalah ....
 

Jawaban:

begin mathsize 14px style n subscript N H subscript 3 end subscript equals 200 cross times 0 comma 6 equals 120 space mmol n subscript HCl equals 100 cross times 0 comma 6 equals 60 space mmol  N H subscript 3 open parentheses aq close parentheses and H Cl open parentheses aq close parentheses yields N H subscript 4 Cl open parentheses aq close parentheses 120 space space space space space space space space space space space 60 bottom enclose negative sign 60 space space space space space space space space space minus sign 60 space space space space space space space space space space space space space space space space 60 end enclose 60 space space space space space space space space space space space space 0 space space space space space space space space space space space space space space space space space space space space space space 60  open square brackets O H to the power of minus sign close square brackets equals K subscript 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 begin display style bevelled 60 over 300 end style over denominator bevelled 60 over 300 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  pOH equals minus sign log open square brackets O H to the power of minus sign close square brackets pOH equals 5  pH equals 9 end style

Dengan demikian, maka jawaban yang tepat adalah 9.

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