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Pertanyaan

Ke dalam 1 d m cubed larutan basa lemah N H subscript 3 0,1 M left parenthesis K b space equals space 10 to the power of negative 5 end exponent right parenthesis ditambahhkan 1 d m cubed larutan HCl 0,1 M, menurut persaman sebagai berikut :

NH subscript 3 space left parenthesis aq right parenthesis space plus space HCL space left parenthesis aq right parenthesis space rightwards arrow space NH subscript 4 Cl left parenthesis aq right parenthesis

Besarnya pH larutan setelah dicampur adalah ...... left parenthesis K w space equals space 10 to the power of negative 14 end exponent right parenthesis

 

  1. 5 comma 0 space minus space log space 1

  2. 5 comma 5 space minus space log space square root of 5

  3. 7 comma 0 space plus space log space 1

  4. 5 comma 5 space minus space log space square root of 2

  5. 9 comma 0 space plus space log space 1

S. Hidayati

Master Teacher

Mahasiswa/Alumni Universitas Indonesia

Jawaban terverifikasi

Pembahasan

left square bracket NH subscript 4 Cl right square bracket equals mol over Vtotal equals fraction numerator 0 comma 1 mol over denominator 2 straight L end fraction equals 0 comma 05 space straight M  NH subscript 4 Cl space merupakan space garam space asam comma sehingga colon  left square bracket straight H plus right square bracket equals square root of fraction numerator Kw space cross times space left square bracket garam right square bracket space over denominator Kb end fraction end root equals square root of fraction numerator 10 to the power of negative 14 end exponent cross times space left square bracket 0 comma 05 right square bracket over denominator 10 to the power of negative 5 end exponent end fraction end root equals square root of 5 cross times 10 to the power of negative 11 end exponent end root equals square root of 5 space cross times space 10 to the power of – 5 comma 5 end exponent straight M  pH equals negative log space square root of 5 cross times 10 to the power of – 5 comma 5 end exponent straight M equals 5 comma 5 – log square root of 5

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