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Sebanyak 100 mL larutan NH 4 OH 0,15 M dicampurkan dengan 50 mL larutan HCl 0,3 M (Kb NH 4 OH = 1 x 10 -5 ), maka pH campuran tersebut adalah….

Sebanyak 100 mL larutan NH4OH 0,15 M dicampurkan dengan 50 mL larutan HCl 0,3 M (Kb NH4OH = 1 x 10-5), maka pH campuran tersebut adalah….

  1. 5

  2. 6

  3. 7

  4. 8

  5. 9

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S. Utari

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Diketahui: M NH 4 OH = 0,15 M V NH 4 OH = 100 mL V HCl = 50 mL M HCl = 0,3 M Kb NH 4 OH = 1 x 10 -5 Ditanya: pH ….? Dijawab:

Diketahui:      M NH4OH = 0,15 M

                     V NH4OH = 100 mL

                     V HCl = 50 mL

                     M HCl = 0,3 M

                     Kb NH4OH = 1 x 10-5

Ditanya: pH ….?

Dijawab:

n space N H subscript 4 O H space equals space 0 comma 15 space cross times space 100 space equals space 15 space m m o l space space n space H C l space equals space 0 comma 3 space cross times space 50 space equals space 15 space m m o l space left square bracket N H subscript 4 C l right square bracket space equals space fraction numerator 15 space m m o l over denominator 150 space m L end fraction space equals space 0 comma 1 space M space space left square bracket H to the power of plus right square bracket space equals space square root of fraction numerator K w over denominator K b end fraction space cross times space left square bracket G a r a m right square bracket end root space space space space space space space space space space equals space square root of 10 to the power of negative 14 end exponent over 10 to the power of negative 5 end exponent space space cross times space 0 comma 1 space end root space space space space space space space space space space equals space 10 to the power of negative 5 end exponent space p H space space space equals space minus space log space left square bracket H to the power of plus right square bracket space space space space space space space space space space space space equals space minus space log space 10 to the power of negative 5 space end exponent space space space space space space space space space space equals space 5

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