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Suatu garam Mg 3 (PO 4 ) 2 1,31 gram (Mr = 262 gram/mol) dilarutkan ke dalam 200 mL air. Besar kelarutan ion Mg 2+ dalam air adalah….

Suatu garam Mg3(PO4)2 1,31 gram (Mr = 262 gram/mol) dilarutkan ke dalam 200 mL air. Besar  kelarutan ion Mg2+ dalam air adalah….

  1. 7,5 x 10-4 M

  2. 7,5 x 10-3 M

  3. 75 x 10-2 M

  4. 75 x 10-4 M

  5. 7,5 x 10-2 M

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S. Utari

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Diketahui: Massa Mg 3 (PO 4 ) 2 = 1,31 gram ; Mr = 262 gram/mol Volume larutan = 200 mL Ditanya: sMg 2+ ...? Dijawab:

Diketahui: Massa Mg3(PO4)2 = 1,31 gram ; Mr = 262 gram/mol 

                 Volume larutan = 200 mL 

Ditanya: s Mg2+ ...?

Dijawab: 

begin mathsize 12px style left square bracket M g subscript 3 left parenthesis P O subscript 4 right parenthesis subscript 2 right square bracket space equals space fraction numerator M a s s a space x space 1000 over denominator M r space x space v o l u m e space l a r u tan space end fraction space left square bracket M g subscript 3 left parenthesis P O subscript 4 right parenthesis subscript 2 right square bracket space equals space fraction numerator 1 comma 31 space g r a m space x space 1000 over denominator 262 space g r a m divided by m o l space x space 200 space m L space space end fraction left square bracket M g subscript 3 left parenthesis P O subscript 4 right parenthesis subscript 2 right square bracket space equals 2 comma 5 space x space 10 to the power of negative 2 end exponent space m o l divided by L  M g subscript 3 left parenthesis P O subscript 4 right parenthesis subscript 2 space space space space space space space space rightwards harpoon over leftwards harpoon space space space space space space space space 3 M g to the power of 2 plus end exponent space space space space space space plus space space space space space 2 P O subscript 4 to the power of 3 minus end exponent 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 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 space space space space space space space space space space space 2 s 2 comma 5 space x space 10 to the power of negative 2 end exponent space space space space space space space space space space space space space space 3 left parenthesis 2 comma 5 space x space 10 to the power of negative 2 end exponent right parenthesis space space space space space space space 2 left parenthesis 2 comma 5 space x space 10 to the power of negative 2 end exponent right parenthesis  M a k a comma space k e l a r u tan space i o n space M g to the power of 2 plus end exponent space a d a l a h space 7 comma 5 space x space 10 to the power of negative 2 end exponent space m o l divided by L end style

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