Respuesta :
Answer:
Explanation:
Mg₃(PO₄)₂ -------------------→ 3Mg⁺² + 2PO₄⁻³
x 3x 2x
given (3x)³ x ( 2 x )² = 10⁻²⁴
= 108 x⁵ = 10⁻²⁴
x⁵ = 9259 x 10⁻³⁰
x = 6.21 x 10⁻⁶ mol / l
= 263 x 6.21 x 10⁻⁶ ( mol weight of magnesium phosphate = 263 )
= 1633 x 10⁻⁶ gm .
b )
Mg(NO3)2 = Mg⁺² + 2 NO₃⁻¹
.01 M .01 M .02 M
(.01)³ x [ PO₄⁻³ ] = 10⁻²⁴
10⁻⁶ x (2x)² = 10⁻²⁴
x² = .25 x 10⁻¹⁸
x = .5 x 10⁻⁹ mol /l
= 263 x .5 x 10⁻⁹ gm / l
= 131.5 x 10⁻⁹ gm /l
c )
Na₃PO₄ = 3 Na ⁺¹ + PO₄⁻³
.02 .02
(.02)² x [ Mg ⁺² ] = 10⁻²⁴
.0004 x (3x) ³ = 10⁻²⁴
x³ = 92.6 x 10⁻²⁴
x = 4.52 x 10⁻⁸ mol/l
= 263 x 4.52 x 10⁻⁸ mol/l
= 1188.76 x 10⁻⁸ gm / l
