What is the concentration of Ca2+ in ppm (mg/L) in cave water saturated with calcite (calcium...

What is the concentration of Ca2+ in ppm (mg/L) in cave water saturated with calcite (calcium carbonate, Ksp = 4.7 × 10-9)?

Answer:2.7

Expert Solution

Ksp = 4.7 x 10^-9

CaCO3 ------------------------> Ca+2 + CO3-2

Ksp = [Ca+2][CO3-2]

4.7 x 10^-9 = S^2

S = 6.86 x 10^-5 M

molarity of Ca+2 = 6.86 x 10^-5 M

ppm = mg / L

molarity of Ca+2 = 6.86 x 10^-5 mol / L

= ( 6.86 x 10^-5 mol / L ) x ( 40 g / mol )

= 2.7 x 10^-3 g / L

= 2.7 mg / L

= 2.7 ppm ------------------------> answer

queen_honey_blossom answered 2 years ago

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