Author Question: An industrial plant processes its waste water through a sedimentation tank that removes hazardous ... (Read 118 times)

V@ndy87 · **on:** Mar 21, 2021

Question 1

A solution is prepared from 3.5 × 10²mL of 3.2 M Pb(NO₃)₂ and 2.0×10² mL of 0.020 M NaCl. Given that K_sp for lead chloride is 1.6×10^-5, what is the equilibrium concentration of the chloride ion?

Reference: Ref 16-1

◦ 3.9 × 10^–4
◦ 8.0 × 10^–6
◦ 2.8 × 10^–3
◦ 6.1 × 10^–2
◦ None of these are correct.

Question 2

An industrial plant processes its waste water through a sedimentation tank that removes hazardous metals by precipitating them as insoluble carbonate salts. If sodium carbonate is gradually added to the tank, what would be the order of precipitation of the metals, Pb²⁺, Cu²⁺, Hg₂²⁺, and Zn²⁺if each is ≈ 1.0 × 10^–4M? ( K_spof PbCO₃= 7.4 × 10^–14, K_spof CuCO₃= 1.4 × 10^–10, K_spof Hg₂CO₃= 8.9 × 10^–17, and K_spof ZnCO₃= 1.4 × 10^–11)

◦ Pb²⁺, Hg₂²⁺, Zn²⁺, Cu²⁺
◦ Hg₂²⁺, Pb²⁺, Zn²⁺, Cu²⁺
◦ Cu²⁺, Zn²⁺, Pb²⁺, Hg₂²⁺
◦ Cu²⁺, Zn²⁺, Hg₂²⁺, Pb²⁺
◦ All metal ions will precipitate at the same time.

tsternbergh47 · **Reply #1 on:** Mar 21, 2021

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Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.

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