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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 ) Harga pH larutan yang terjadi adalah ....

Larutab HCl 0,8 M sebanyak 100 mL ditambahkan pada 100 mL larutan menurut reaksi:

Harga pH larutan yang terjadi adalah ....

  1. 5 minus log space 2

  2. 5 plus log space 2

  3. 5 plus log space 4

  4. 9 minus log space 4

  5. 9 plus log space 2

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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 N H subscript 3 space space space space space space space space plus space space space space space space H C l space space space space space rightwards arrow space space space space space N H subscript 4 C l space  M u l a space space space space space space space space 80 space m m o l space space space space space space space space space space space 80 space m m o l space space space  R e a k s i space minus 80 space m m o l space space space space space space minus space 80 space m m o l space space space plus 80 space m m o l space space space space  S i s a 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 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 80 space m m o l space space space space space space

 

left square bracket N H subscript 4 C l right square bracket space equals space fraction numerator m o l over denominator V space t o t a l end fraction space equals space fraction numerator 0 comma 08 space m o l over denominator 0 comma 2 space L end fraction space equals space 0 comma 4 space 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 x left square bracket g a r a m right square bracket over denominator K b end fraction end root equals square root of fraction numerator 10 to the power of negative 14 end exponent x left square bracket 0 comma 4 right square bracket over denominator 10 to the power of negative 5 end exponent end fraction end root equals square root of 4 x 10 to the power of negative 10 end exponent end root equals 2 x 10 to the power of negative 5 end exponent M  p H equals negative l o g 2 x 10 to the power of negative 5 end exponent equals 5 – l o g 2

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