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Dalam 100 mL larutan PbCl2​ terlarut 0,2207 g PbCl2​ di dalamnya. Apakah larutan tersebut akan terbentuk endapan? (Diketahui Ksp PbCl2​=2,4×10–4, Ar Pb = 207 dan Ar Cl = 35,5).

Pertanyaan

Dalam 100 mL larutan Pb Cl subscript 2 terlarut 0,2207 g Pb Cl subscript 2 di dalamnya. Apakah larutan tersebut akan terbentuk endapan? (Diketahui Ksp Pb Cl subscript 2 equals 2 comma 4 cross times 10 to the power of – 4 end exponent, Ar Pb = 207 dan Ar Cl = 35,5).

I. Solichah

Master Teacher

Jawaban terverifikasi

Pembahasan

Larutan tersebut tidak terbentuk endapan karena harga Ksp lebih besar daripada harga Qc.

table attributes columnalign right center left columnspacing 0px end attributes row blank blank 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 048 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank middle dot end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 6 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank less than blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 4 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank middle dot end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 4 end exponent end cell end table space space space space space space space space space space space space space space table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank Qc end table table attributes columnalign right center left columnspacing 0px end attributes row blank less than blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank Ksp end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank left parenthesis end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank tidak end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank terbentuk end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank endapan end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank right parenthesis end table

Harga Ksp suatu elektrolit dapat digunakan untuk memperkirakan apakah elektrolit tersebut dapat larut atau mengendap dalam suatu larutan. Semakin besar harga Ksp suatu senyawa, maka semakin mudah larut senyawa tersebut. Dengan membandingkan harga Ksp dengan harga hasil kali konsentrasi ion-ion (Qc) yang ada dalam larutan yang dipangkatkan dengan koefisien reaksi masing-masing, maka ada tiga kemungkinan yang akan terjadi jika dua buah larutan elektrolit dicampurkan, yaitu:

  • Jika Qsp < Ksp, larutan belum jenuh (tidak ada endapan)
  • Jika Qsp = Ksp, larutan tepat jenuh (belum ada endapan)
  • Jika Qsp > Ksp, larutan lewat jenuh (ada endapan)

Untuk menentukan apakah larutan tersebut akan terbentuk endapan, langkah-langkahnya sebagai berikut:

Menentukan molaritas Pb Cl subscript 2 yang terlarut:

table attributes columnalign right center left columnspacing 0px end attributes row cell M space Pb Cl subscript 2 end cell equals cell fraction numerator massa space open parentheses gram close parentheses over denominator Mr end fraction cross times 1000 over mL end cell row blank equals cell fraction numerator 0 comma 2207 over denominator 207 plus 2 left parenthesis 35 comma 5 right parenthesis end fraction cross times 1000 over 100 end cell row blank equals cell fraction numerator 0 comma 2207 over denominator 278 end fraction cross times 10 end cell row blank equals cell 0 comma 008 space M end cell end table

Menentukan harga Qc Pb Cl subscript 2:

space Pb Cl subscript 2 space space rightwards harpoon over leftwards harpoon space space Pb to the power of 2 plus sign space space plus space space 2 Cl to the power of minus sign 8 middle dot 10 to the power of negative sign 3 end exponent space space space space space 8 middle dot 10 to the power of negative sign 3 end exponent space space space space space 1 comma 6 middle dot 10 to the power of negative sign 2 end exponent

table attributes columnalign right center left columnspacing 0px end attributes row Qc equals cell open square brackets Pb to the power of 2 plus sign close square brackets open square brackets Cl to the power of minus sign close square brackets squared end cell row blank equals cell left parenthesis 8 middle dot 10 to the power of negative sign 3 end exponent right parenthesis left parenthesis 1 comma 6 middle dot 10 to the power of negative sign 2 end exponent right parenthesis squared end cell row blank equals cell left parenthesis 8 middle dot 10 to the power of negative sign 3 end exponent right parenthesis left parenthesis 2 comma 56 middle dot 10 to the power of negative sign 4 end exponent right parenthesis end cell row blank equals cell 20 comma 48 middle dot 10 to the power of negative sign 7 end exponent end cell row blank equals cell 2 comma 048 middle dot 10 to the power of negative sign 6 end exponent end cell end table

Membandingkan harga Qc dengan Ksp

space space space space space space space space space space space space space space Qc space.... table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank Ksp end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 048 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank middle dot end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 6 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank less than blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 4 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank middle dot end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 4 end exponent end cell end table space space space space space space space space space space space space space space table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank Qc end table table attributes columnalign right center left columnspacing 0px end attributes row blank less than blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank Ksp end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank left parenthesis end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank tidak end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank terbentuk end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank endapan end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank right parenthesis end table

Karena harga Ksp lebih besar daripada harga Qc, maka larutan tersebut tidak terbentuk endapan.

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