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Larutan NH 4 OH 0,4 M sebanyak 100 mL dicampur dengan 100 mL larutan HCl 0,4 M (Kb = 2 x 10 –5 ). Nilai pH campuran larutan tersebut adalah….

Larutan NH4OH 0,4 M sebanyak 100 mL dicampur dengan 100 mL larutan HCl 0,4 M (Kb = 2 x 10–5). Nilai pH campuran larutan tersebut adalah….

  1. 5

  2. 9

  3. 8

  4. 6

  5. 10

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J. Siregar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Diketahui : M NH 4 OH = 0,4 M VNH 4 OH = 100 ml M HCl = 0,4 M V HCl = 100 ml Kb = 2 x 10 -5 mol NH 4 OH = M x V = 0,4 M x 100 mL = 40 mmol mol HCl = M x V = 0,4 M x 100 mL = 40 mmol Karena NH 4 Cl merupakan garam yang berasal dari basa lemah (NH 4 OH) dan asam kuat (HCl), maka:

Diketahui :

M NH4OH = 0,4 M                 V NH4OH = 100 ml

M HCl = 0,4 M                        V HCl = 100 ml

Kb = 2 x 10-5

 

mol NH4OH  = M x V

                     = 0,4 M x 100 mL = 40 mmol

mol HCl  = M x V

               = 0,4 M x 100 mL = 40 mmol

 

space space space space space space space space space NH subscript 4 OH space space space space plus space space space space HCl space space space space space space space rightwards harpoon over leftwards harpoon space space space space space space space NH subscript 4 Cl space space space space space plus space space space space space space straight H subscript 2 straight O space straight m space space space space 40 space mmol space space space space space space space space space space space 40 space mmol 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 minus space straight b space space space space space 40 space mmol space space space space space space space space space space space 40 space mmol space space space space space space space space space space space space space 40 space mmol space space space space space space space space space space space space 40 space mmol space straight s 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 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 40 space mmol space space space space space space space space space space space space 40 space mmol  straight M space NH subscript 4 Cl space equals space fraction numerator m o l space N H subscript 4 C l over denominator v o l u m e space t o t a l end fraction equals fraction numerator 40 space m m o l over denominator 200 space m l end fraction equals 0 comma 2 space straight M

Karena NH4Cl merupakan garam yang berasal dari basa lemah (NH4OH) dan asam kuat (HCl), maka:

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 cross times open square brackets N H subscript 4 C l close square brackets cross times v a l e n s i end root 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 2 cross times 10 to the power of negative 5 end exponent end fraction cross times 0 comma 2 cross times 1 end root end cell row blank equals cell 1 cross times 10 to the power of negative 5 end exponent space straight M end cell row blank blank blank row cell pH space end cell equals cell space minus log space open square brackets straight H to the power of plus close square brackets end cell row blank equals cell space minus log space open parentheses 1 cross times 10 to the power of negative 5 end exponent close parentheses end cell row blank equals cell 5 minus log space 1 end cell row blank equals 5 end table

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