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Sebanyak 200 mL larutan , dimasukkan ke dalam 5 wadah berbeda. Setiap wadah berisi 200 mL larutan yang mengandung ion dengan molaritas 0,02 M. Pasangan garam berikut yang tidak membentuk endap

Sebanyak 200 mL larutan begin mathsize 14px style Ag N O subscript 3 space 0 comma 02 space M end style, dimasukkan ke dalam 5 wadah berbeda. Setiap wadah berisi 200 mL larutan yang mengandung ion begin mathsize 14px style S to the power of 2 minus sign comma space P O subscript 4 to the power of 3 minus sign comma space Cr O subscript 4 to the power of 2 minus sign comma space Br to the power of minus sign comma space dan space S O subscript 4 to the power of 2 minus sign end style dengan molaritas 0,02 M. 

table attributes columnalign right center left columnspacing 0px end attributes row cell Diketahui space harga space K subscript sp colon space Ag subscript 2 S space space space space space space end cell equals cell 2 cross times 10 to the power of negative sign 49 end exponent semicolon end cell row cell Ag subscript 3 P O subscript 4 space space end cell equals cell 1 cross times 10 to the power of negative sign 20 end exponent semicolon end cell row cell Ag subscript 2 Cr O subscript 4 end cell equals cell 6 cross times 10 to the power of negative sign 5 end exponent semicolon end cell row cell Ag Br space space space space space space space end cell equals cell 5 cross times 10 to the power of negative sign 13 end exponent semicolon space dan end cell row cell Ag subscript 2 S O subscript 4 space space end cell equals cell 3 cross times 10 to the power of negative sign 5 end exponent end cell end table   

Pasangan garam berikut yang tidak membentuk endapan adalah . . . .

  1. begin mathsize 14px style Ag subscript 2 S space dan space Ag Br end style 

  2. begin mathsize 14px style Ag subscript 2 S space dan space Ag subscript 3 P O subscript 4 end style 

  3. begin mathsize 14px style Ag Br space dan space Ag subscript 2 S O subscript 4 end style 

  4. begin mathsize 14px style Ag subscript 3 P O subscript 4 space dan space Ag Br end style 

  5. begin mathsize 14px style Ag subscript 2 Cr O subscript 4 space dan space Ag subscript 2 S O subscript 4 end style 

Jawaban:

Kata Kuncinya adalah garam yang tidak mengendap nilai Qsp < Ksp

Langkah pertama menentukan Qsp masing-masing garam:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Q subscript sp space Ag subscript 2 S end cell equals cell open square brackets Ag to the power of plus sign close square brackets squared open square brackets S to the power of 2 minus sign close square brackets end cell row blank equals cell open parentheses 0 comma 04 close parentheses squared open parentheses 0 comma 04 close parentheses end cell row blank equals cell 6 comma 4 cross times 10 to the power of negative sign 5 end exponent end cell row cell Q subscript sp space Ag subscript 3 P O subscript 4 end cell equals cell open square brackets Ag to the power of plus sign close square brackets cubed open square brackets P O subscript 4 to the power of 3 minus sign close square brackets end cell row blank equals cell open parentheses 0 comma 04 close parentheses cubed open parentheses 0 comma 04 close parentheses end cell row blank equals cell 2 comma 56 cross times 10 to the power of negative sign 6 end exponent end cell row cell Q subscript sp space Ag subscript 2 Cr O subscript 4 end cell equals cell open square brackets Ag to the power of plus sign close square brackets squared open square brackets Cr O subscript 4 to the power of 2 minus sign close square brackets end cell row blank equals cell open parentheses 0 comma 04 close parentheses squared open parentheses 0 comma 04 close parentheses end cell row blank equals cell 6 comma 4 cross times 10 to the power of negative sign 5 end exponent end cell row cell Q subscript sp space Ag Br end cell equals cell open square brackets Ag to the power of plus sign close square brackets open square brackets Br to the power of minus sign close square brackets end cell row blank equals cell open parentheses 0 comma 04 close parentheses open parentheses 0 comma 04 close parentheses end cell row blank equals cell 1 comma 6 cross times 10 to the power of negative sign 3 end exponent end cell row cell Q subscript sp space Ag subscript 2 S O subscript 4 end cell equals cell open square brackets Ag to the power of plus sign close square brackets squared open square brackets S O subscript 4 to the power of 2 minus sign close square brackets end cell row blank equals cell open parentheses 0 comma 04 close parentheses squared open parentheses 0 comma 04 close parentheses end cell row blank equals cell 6 comma 4 cross times 10 to the power of negative sign 5 end exponent end cell end table end style  

Diantara garam di atas yang mempunyai nilai Qsp < Ksp yaitu begin mathsize 14px style Ag subscript 2 Cr O subscript 4 space dan space Ag subscript 2 S O subscript 4 end style 

jadi, jawaban yang benar adalah E

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