metals-can-be-removed-from-water-by-precipitation-ca2-aq-na2co3-aq-caco3-s-2-na-

Question

Metals can be removed from water by precipitation.

Ca²⁺ (aq) + Na₂CO₃ (aq) → CaCO₃ (s) + 2 Na⁺ (aq)

Fe²⁺(aq) + Ca(OH)₂ (aq) → Fe(OH)₂ (s) + Ca²⁺ (aq)

If 1700 L sample of water has 4.0x10^-5 M Ca²⁺ and 8.0x10^-7 M Fe²⁺, calculate the moles of Na₂CO₃ and Ca(OH)₂ needed to precipitate them.

Accepted Answer

6.9x10^-2 mol Na₂CO₃ and 1.4x10^-3 mol Ca(OH)₂

Answer

1.4x10^-3 mol Na₂CO₃ and 6.9x10^-2 mol Ca(OH)₂

Answer

4.0x10^-5 mol Na₂CO₃ and 8.0x10^-7 mol Ca(OH)₂

Answer

2.0x10^-5 mol Na₂CO₃ and 4.0x10^-7 mol Ca(OH)₂