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Banyaknya (NH 4 ) 2 SO 4 (Mr = 132) yang harus dimasukkan kedalam 100 mL larutan agar di peroleh pH = 5 adalah …. (Kb NH 4 OH = 2 x 10 -5 )

Banyaknya (NH4)2SO4 (Mr = 132) yang harus dimasukkan kedalam 100 mL larutan agar di peroleh pH = 5 adalah …. (Kb NH4OH = 2 x 10-5)

  1. 1,32 gram

  2. 13,2 gram

  3. 2,64 gram

  4. 26,4 gram

  5. 3,96 gram

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M. Firdhaus

Master Teacher

Mahasiswa/Alumni Universitas Jember

Jawaban terverifikasi

Pembahasan

p H space equals space 5 comma space space left square bracket H to the power of plus right square bracket space equals space 10 to the power of negative 5 end exponent space M left square bracket H to the power of plus right square bracket space equals space square root of fraction numerator 10 to the power of negative 14 end exponent space x space left square bracket G right square bracket space x space 2 over denominator 2.10 to the power of negative 5 end exponent end fraction end root 10 to the power of negative 5 end exponent space equals space space square root of fraction numerator 10 to the power of negative 14 end exponent space x space left square bracket G right square bracket space x space 2 over denominator 2.10 to the power of negative 5 end exponent end fraction end root 10 to the power of negative 10 space end exponent equals space square root of fraction numerator 10 to the power of negative 14 end exponent space x space left square bracket G right square bracket space x space 2 over denominator 2.10 to the power of negative 5 end exponent end fraction end root left square bracket left parenthesis N H subscript 4 right parenthesis subscript 2 S O subscript 4 right square bracket space equals space 0 comma 1 space M m o l space left parenthesis N H subscript 4 right parenthesis subscript 2 S O subscript 4 space equals space 0 comma 1 space M space x space 0 comma 1 space L space equals space 0 comma 01 space m o l space M a s s a space space left parenthesis N H subscript 4 right parenthesis subscript 2 S O subscript 4 equals space 0 comma 01 space m o l space x space 132 space equals space 1 comma 32 space g r a m

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