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Sebanyak 18,03 gram Ba 3 (PO 4 ) 2 dilarutkan dalam 1 liter larutan, maka kelarutan ion PO 4 3- dalam larutan tersebut adalah….(Ar Ba = 137 ;Ar P =31 ;Ar O =16)

Sebanyak 18,03 gram Ba3(PO4)2 dilarutkan dalam 1 liter larutan, maka kelarutan ion PO43- dalam larutan tersebut adalah….(Ar Ba = 137 ; Ar P = 31 ; Ar O = 16)

  1. 3 x 10-2 M

  2. 9 x 10-2 M

  3. 6 x 10-2 M

  4. 3 x 10-3 M

  5. 6 x 10-3 M

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S. Utari

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

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Pembahasan

Diketahui: MassaBa 3 (PO 4 ) 2 = 18,03 gram Volume larutan = 1 L Ditanya: sPO 4 3- ...? Dijawab: MrBa 3 (PO 4 ) 2 = 3 (Ar Ba) + 2 (Ar P) + 8 (Ar O) = 3(137) + 2(31) + 8 (16) = 601 gram/mol

Diketahui: Massa Ba3(PO4)2 = 18,03 gram 

                 Volume larutan = 1 L 

Ditanya: s PO43- ...?

Dijawab: 

Mr Ba3(PO4)2 = 3 (Ar Ba) + 2 (Ar P) + 8 (Ar O) 

                       = 3(137) + 2(31) + 8 (16) 

                       = 601 gram/mol 

begin mathsize 12px style left square bracket B a 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 left square bracket B a subscript 3 left parenthesis P O subscript 4 right parenthesis subscript 2 right square bracket space equals space fraction numerator 18 comma 03 space g r a m space x space 1000 over denominator 601 space g r a m space space x space 1000 space m L space end fraction left square bracket B a subscript 3 left parenthesis P O subscript 4 right parenthesis subscript 2 right square bracket space equals 0 comma 03 space M space rightwards arrow space s B a 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 3 B a to the power of 2 plus end exponent space space space space space space plus space space space space 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 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 3 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 2 s space space space space space space 0 comma 03 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 left parenthesis 0 comma 03 right parenthesis space space space space space space space space space space space space space space space space space space 2 left parenthesis 0 comma 03 right parenthesis space M a k a comma space k e l a r u tan space i o n space P O subscript 4 to the power of 3 minus end exponent space a d a l a h space 0 comma 06 space M space a t a u space 6 space x space 10 to the power of negative 2 end exponent space m o l divided by L. space space space end style 

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