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Campuran yang terdiri dari 100 mL larutan NH 4 OH 0,2 M dengan 100 mL larutan HCl 0,2 M (Kb = 10 –5 ) mempunyai nilai pH sebesar….

Campuran yang terdiri dari 100 mL larutan NH4OH 0,2 M dengan 100 mL larutan HCl 0,2 M (Kb = 10–5) mempunyai nilai pH sebesar….

  1. 5

  2. 6

  3. 8

  4. 9

  5. 10

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J. Siregar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

NH 4 Cl merupakan garam yang dihasilkan dari reaksi NH 4 OH (basa lemah) dan HCl (asam kuat), sehingga garam tersebut mengalami hidrolisis parsial asam. Penentuan pH untuk garam yang mengalami reaksi hidrolisis parsial asam adalah sebagai berikut:

table attributes columnalign right center left columnspacing 0px end attributes row cell NH subscript 4 OH end cell equals cell straight M cross times straight V end cell row blank equals cell 0 comma 2 space straight M cross times 100 space mL equals 20 space mmol end cell row cell straight n space HCl end cell equals cell straight M cross times straight V end cell row blank equals cell 0 comma 2 space straight M cross times 100 space mL equals 20 space mmol end cell end table

space space space space space space NH subscript 4 OH space space space space space space space space plus space space space space space space space space HCl space space space space space space space space space space space space space space rightwards harpoon over leftwards harpoon space space space space space space space space space space space space space NH subscript 4 Cl straight m space space space 20 space mmol space space space space space space space space space space space space space space space space space space 20 space mmol space space space space space space space space space space space space space space space space space space space space space space space minus straight b space space space space 20 space mmol space space space space space space space space space space space space space space space space space space 20 space mmol space space space space space space space space space space space space space space space space space space space 20 space mmol straight s space space space space minus 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 space space space space space minus 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 space space space space space space space space space 20 space mmol

straight M space NH subscript 4 Cl equals fraction numerator mol over denominator volume space total end fraction equals fraction numerator 20 space mmol over denominator 200 space mL end fraction equals 0 comma 1 space straight M

NH4Cl merupakan garam yang dihasilkan dari reaksi NH4OH (basa lemah) dan HCl (asam kuat), sehingga garam tersebut mengalami hidrolisis parsial asam. Penentuan pH untuk garam yang mengalami reaksi hidrolisis parsial asam adalah sebagai berikut:

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets straight H to the power of plus close square brackets end cell equals cell square root of K subscript w over K subscript b open square brackets Garam close square brackets end root cross times v a l e n s i end cell row cell open square brackets straight H to the power of plus close square brackets end cell equals cell square root of fraction numerator 1 cross times 10 to the power of negative 14 end exponent over denominator 1 cross times 10 to the power of negative 5 end exponent end fraction cross times 0 comma 1 cross times 1 end root end cell row cell open square brackets straight H to the power of plus close square brackets end cell equals cell 1 cross times 10 to the power of negative 5 end exponent end cell row pH equals cell negative log space open square brackets straight H to the power of plus close square brackets end cell row pH equals cell negative log space open parentheses 1 cross times 10 to the power of negative 5 end exponent close parentheses end cell row pH equals 5 end table

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