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Larutan N H 3 ​ 0 , 2 M ( K b = 1 × 1 0 − 5 ) sebanyak 50 mL ditambahkan ke dalam 50 mL larutan HCl 0,2 sehingga terjadi reaksi: N H 3 ​ ( a q ) + H Cl ( a q ) → N H 4 ​ Cl ( a q ) ( K w = 1 0 − 14 ) . Harga pH larutan tersebut adalah ....

Larutan sebanyak 50 mL ditambahkan ke dalam 50 mL larutan HCl 0,2 sehingga terjadi reaksi: . Harga pH larutan tersebut adalah ....
 

  1. 5

  2. 6
     

  3. 8

  4. 9

     

  5. 10

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A. Ratna

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

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Pembahasan

space space space space space space space space space space space space space space space space space space space N H subscript 3 space space space space space space plus space space space H C l space space space space space space space space rightwards arrow space space space space N H subscript 4 C l  M u l a space space space space space space space space space 10 m m o l space space space space space space space 10 m m o l  R e a k s i space space minus 10 m m o l space space space minus 10 m m o l space space space space space plus 10 m m o l  S i s a 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 0 space space space space space space space space space space space space space space space space space space space space space 10 m m o l    left square bracket N H subscript 4 C l right square bracket equals fraction numerator m o l over denominator V t o t a l end fraction equals fraction numerator left parenthesis 0 comma 01 m o l right parenthesis over denominator left parenthesis 0 comma 1 L right parenthesis end fraction equals 0 comma 1 M  N H subscript 4 C l space m e r u p a k a n space g a r a m space a s a m comma space s e h i n g g a colon  left square bracket H plus right square bracket equals square root of fraction numerator K w space cross times left square bracket g a r a m right square bracket over denominator X b end fraction end root equals square root of fraction numerator 10 to the power of negative 14 end exponent x space left square bracket 0 comma 1 right square bracket over denominator 10 to the power of negative 5 end exponent end fraction end root equals square root of 10 to the power of negative 10 end exponent end root equals 10 to the power of negative 5 end exponent space M  p H equals negative l o g 10 to the power of negative 5 end exponent equals 5

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Larutab HCl 0,8 M sebanyak 100 mL ditambahkan pada 100 mL larutan N H 3 ​ 0 , 8 M ( K b N H 3 ​ = 1 × 1 0 − 5 , K w = 1 0 − 14 ) menurut reaksi: N H 3 ​ ( a q ) + H Cl ( a q ) → N H 4 ​ Cl ( a q ) ...

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