A swimming pool was sufficiently alkaline so that the carbon ...

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Question 1

A solution of NaF(aq) is added dropwise to a solution that is 0.0102 mol L^-1 in Ba²⁺(aq). When the concentration of F^-(aq) exceeds ________ mol L^-1, BaF₂(s) will precipitate. Neglect volume changes. For BaF₂(s),
◦ 8.6 × 10^-5
◦ 1.3 × 10^-2
◦ 1.7 × 10^-8
◦ 3.3 × 10^-3
◦ 1.7 × 10^-4

Question 2

A swimming pool was sufficiently alkaline so that the carbon dioxide absorbed from the air produced a solution in the pool that was 2 × 10^-4 M in carbonate ion. If the pool originally contained 4 × 10^-3 M Mg²⁺, 6 × 10^-4 M Ca²⁺, and 8 × 10^-7 M Fe²⁺, then the precipitate that was formed consisted of ________.
(K_sp values are: CaCO₃, 4.7 × 10^-9; MgCO₃, 4.0 × 10^-5; FeCO₃, 2.0 × 10^-11)
◦ only MgCO₃
◦ only CaCO₃
◦ only FeCO₃
◦ only CaCO₃ and FeCO₃
◦ MgCO₃, CaCO₃, and FeCO₃

[ryhom]

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