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Sebanyak 0,62 g  dilarutkan dalam 100 mL air. Kemu...

Sebanyak 0,62 g begin mathsize 14px style Ca subscript 3 open parentheses P O subscript 4 close parentheses subscript 2 end style dilarutkan dalam 100 mL air. Kemudian campuran ini diencerkan dengan faktor pengenceran 15x. Apabila Ksp begin mathsize 14px style Ca subscript 3 open parentheses P O subscript 4 close parentheses subscript 2 end style = 1,08 x 10-25, tentukan massa sisa padatan yang tidak terlarut (dalam mg, gunakan ketelitian 3 desimal).

Jawaban:

Menghitung kelarutan dari nilai Ksp

begin mathsize 14px style Ca subscript 3 open parentheses P O subscript 4 close parentheses subscript 2 yields 3 Ca to the power of 2 plus sign plus 2 P O subscript 4 to the power of 3 minus sign end exponent space space space space space space space space space space space space space space space space space space space space space space 3 s space space space space space space space space space space space 2 s Ksp space Ca subscript 3 open parentheses P O subscript 4 close parentheses subscript 2 space equals space 1 comma 08 space x space 10 to the power of negative sign 25 end exponent space space left parenthesis 3 s right parenthesis cubed left parenthesis 2 s right parenthesis squared space equals space 1 comma 08 space x space 10 to the power of negative sign 25 end exponent 27 s cubed space x space 4 s squared space equals 1 comma 08 space x space 10 to the power of negative sign 25 end exponent space space space space space space space 108 s to the power of 5 space equals space 1 comma 08 space x space 10 to the power of negative sign 25 end exponent space space space space space space space space space space space space space s to the power of 5 space equals space fraction numerator 1 comma 08 space x space 10 to the power of negative sign 25 end exponent over denominator 108 end fraction space space space space space space space space space space space space space s space equals space fifth root of fraction numerator 1 comma 08 space x space 10 to the power of negative sign 25 end exponent over denominator 108 end fraction end root space space space space space space space space space space space space space s space equals space 3 comma 981 space x space 10 to the power of negative sign 6 space end exponent M end style 
 

Menghitung massa begin mathsize 14px style Ca subscript 3 open parentheses P O subscript 4 close parentheses subscript 2 end style 

begin mathsize 14px style M space equals space n over V 3 comma 981 space x space 10 to the power of negative sign 6 space end exponent equals space fraction numerator begin display style massa over Mr end style over denominator V end fraction space space space space space space space space fraction numerator massa over denominator V space end fraction space equals space 3 comma 981 space x space 10 to the power of negative sign 6 space end exponent space x space 310 space space space space space space space space space fraction numerator massa over denominator V space end fraction space equals space 1 comma 234 space x space 10 to the power of negative sign 3 end exponent space g forward slash L space space space space space space space space fraction numerator massa over denominator V space end fraction space equals space 1 comma 234 space mg forward slash L end style 

Volume di encerkan sebanyak 15 kali

V2 =15 x 100 mL = 1500 mL = 1,5 L

massa  begin mathsize 14px style Ca subscript 3 open parentheses P O subscript 4 close parentheses subscript 2 end style yang larut

begin mathsize 14px style m space Ca subscript 3 open parentheses P O subscript 4 close parentheses subscript 2 space yang space larut m space equals space 1 comma 234 space mg forward slash L space x space 1 comma 5 space L space m space equals space 1 comma 851 space mg end style 

Massa yang dilartukan di awal = 0,62 gram = 620 mg

begin mathsize 14px style massa space yang space tidak space larut space equals space 620 space mg space minus sign space 1 comma 851 space mg massa space yang space tidak space larut space equals space 618 comma 149 space mg end style 

Jadi, massa yang tidak laruta adalah 618,148 mg. 

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