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Kelarutan timbal klorida pada suhu 25°C adalah gra...

Kelarutan timbal klorida pada suhu 25°C adalah begin mathsize 14px style 1 comma 7 cross times 10 to the power of negative sign 5 end exponent end style gram dalam 200 mL air. Hasil kali kelarutan begin mathsize 14px style Pb Cl subscript 2 end style adalah....    (Ar : begin mathsize 14px style Pb end style = 207 begin mathsize 14px style gmol to the power of negative sign 1 end exponent end style dan begin mathsize 14px style Cl end style = 35,5 begin mathsize 14px style gmol to the power of negative sign 1 end exponent end style)space

Jawaban:

Untuk menentukan kelarutan suatu zat harus dalam keadan jenuh atau setimbang, dan pada saat keadaan jenuh terjadi reaksi kesetimbangan dengan nilai tetapan kesetimbangannya disebut Ksp, dan kita bisa mendapatkan hubungan antara kelarutan (s) dengan Ksp sebagai berikut :

begin mathsize 14px style A subscript x B subscript y subscript open parentheses italic s close parentheses end subscript rightwards harpoon over leftwards harpoon xA to the power of y plus end exponent subscript open parentheses italic a italic q close parentheses end subscript plus yB to the power of x minus sign end exponent subscript open parentheses italic a italic q close parentheses end subscript Ksp equals open square brackets A to the power of y plus end exponent close square brackets to the power of x middle dot open square brackets B to the power of x minus sign end exponent close square brackets to the power of y end style 

Untuk menentukan begin mathsize 14px style Ksp space Pb Cl subscript 2 end style, dengan cara :

1) Tentukan molaritas dari begin mathsize 14px style Pb Cl subscript 2 end style :

begin mathsize 14px style M equals fraction numerator massa space over denominator Mr end fraction cross times fraction numerator 1000 space over denominator mL end fraction Mr space Pb Cl subscript 2 equals 1 cross times Ar space Pb plus 2 cross times Ar space Cl space space space space space space space space space space space space space space space space equals 1 cross times 207 plus 2 cross times 35 comma 5 Mr space Pb Cl subscript 2 equals 278 M equals fraction numerator 1 comma 7 cross times 10 to the power of negative sign 5 end exponent space over denominator 278 end fraction cross times fraction numerator 1000 space over denominator 200 end fraction M equals 3 cross times 10 to the power of negative sign 7 end exponent end style  

2) Masukkan nilai kelarutan (molaritas) begin mathsize 14px style Pb Cl subscript 2 end style ke rumus Ksp :

begin mathsize 14px style Pb Cl subscript 2 subscript open parentheses italic s close parentheses end subscript rightwards harpoon over leftwards harpoon Pb to the power of 2 plus sign subscript open parentheses italic a italic q close parentheses end subscript plus 2 Cl to the power of minus sign subscript open parentheses italic a italic q close parentheses end subscript space space s space space space space space space space space space space space space space space space space s space space space space space space space space space space space space space space space space 2 s Ksp equals open square brackets Pb to the power of 2 plus sign close square brackets middle dot open square brackets Cl to the power of minus sign close square brackets squared space space space space space space space equals open parentheses s close parentheses middle dot open parentheses 2 s close parentheses squared space space space space space space space equals 4 s cubed Ksp equals 4 open parentheses 3 cross times 10 to the power of negative sign 7 end exponent close parentheses cubed Ksp equals 1 comma 08 cross times 10 to the power of negative sign 19 end exponent end style  

Maka, hasil kali kelarutan (Ksp) begin mathsize 14px style Pb Cl subscript 2 end style adalah begin mathsize 14px style 1 comma 08 cross times 10 to the power of negative sign 19 end exponent end style  

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