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Berapa nilai pH campuran antara 100 ml HCl yang memiliki pH = 2 - log 5 dan 100 mL NH 3 0,1 M (K b = 1 x 10 -6 )?

Berapa nilai pH campuran antara 100 ml HCl yang memiliki pH = 2 - log 5 dan 100 mL NH3 0,1 M (Kb = 1 x 10-6)?space 
 

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S. Lubis

Master Teacher

Jawaban terverifikasi

Jawaban

maka jawaban yang tepat adalah pH = 8.

maka jawaban yang tepat adalah pH = 8.

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Pembahasan

Dengan demikian, maka jawaban yang tepat adalah pH = 8.

open square brackets H Cl close square brackets double bond open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign open parentheses 2 minus sign log space 5 close parentheses end exponent open square brackets H Cl close square brackets double bond open square brackets H to the power of plus sign close square brackets equals 5 cross times 10 to the power of negative sign 2 end exponent n subscript HCl equals open parentheses 5 cross times 10 to the power of negative sign 2 end exponent close parentheses cross times 100 equals 5 space mmol  n subscript N H subscript 3 end subscript equals 0 comma 1 cross times 100 equals 10 space mmol space space space space space H Cl and N H subscript 3 yields N H subscript 4 Cl m space space space 5 space space space space space space space space 10 bottom enclose r space space space space space minus sign 5 space space space space space minus sign 5 space space space space space space space space plus 5 end enclose s space space space space 0 space space space space space space space space space 5 space space space space space space space space space space space 5  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 6 end exponent cross times fraction numerator begin display style bevelled 5 over 200 end style over denominator bevelled 5 over 200 end fraction open square brackets O H to the power of minus sign close square brackets equals 10 to the power of negative sign 6 end exponent pOH equals minus sign log open square brackets O H to the power of minus sign close square brackets pOH equals minus sign log open parentheses 10 to the power of negative sign 6 end exponent close parentheses pOH equals 6  pH equals 14 minus sign pOH pH equals 8

Dengan demikian, maka jawaban yang tepat adalah pH = 8.

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