Author Question: What is the maximum concentration of carbonate ions that will precipitate BaCO3 but not MgCO3 from a ... (Read 26 times)

future617RT · **on:** Mar 21, 2021

Question 1

What is the concentration of the Cd²⁺ion in a 0.035 M Cd(NO₃)₂solution that is also 1.0 M NH₃? At this temperature, K_ffor Cd(NH₃)₄²⁺= 1.0 10⁷.

◦ 3.5

10^–9M
◦ 6.4

10^–9M
◦ 3.5

10^–30M
◦ 1.0

10^–7M
◦ None of these are correct.

Question 2

What is the maximum concentration of carbonate ions that will precipitate BaCO₃ but not MgCO₃ from a solution that is 3.5

10^–3M each in Mg²⁺ and Ba²⁺? For MgCO₃, K_sp = 1.0 × 10^–15 and for BaCO₃, K_sp = 2.6 × 10^–9.

◦ 2.9 × 10^–13M
◦ 7.4 × 10^–7M
◦ 3.2 × 10^–8M
◦ 5.1 × 10^–5M
◦ None of these are correct; MgCO₃will always precipitate before BaCO₃.

nicoleclaire22 · **Reply #1 on:** Mar 21, 2021

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