16-20 work not necessary The K_sp of CaCO_3 is 2.8 times 10^-9 in pure water. Wh

Question

16-20 work not necessary The K_sp of CaCO_3 is 2.8 times 10^-9 in pure water. What is the molar solubility for CaCO_3? A) 6.8 times 10^-4 M B) 5.3 times 10^-4 M C) 3.0 times 10^14 M D) 7.8 times 10^-18 M E) 8.0 times 10^-2M Which process results in an entropy increase for the universe? A) The cooling of a hot cup of coffee in room temperature air B) The evaporation of water from a desk at room temperature C) Snow melting above 0 degree C D) Glass breaking upon hitting the floor E) All of the above In which solution is BaSO_4 most soluble? A. A solution that is 0.1 M in Ba(NO_3)_2 B. A solution that is 0.1 M in Na_2SO_4 C. A solution that is 0.1 M in NaNO_3 D. The solubility is the same in all solutions. E. The K_sp must be known before a prediction can be made. Which of the following processes have delta S = 0? A. CH_4(g) + H_2O(g) rightarrow CO(g) + 3 H_2(g) B. CH_3OH(l) rightarrow CH_3OH(s) C. Na_2CO_3 (s) + H_2O(g) + CO_2(g) rightarrow 2NaHCO_3(s) D. N_2(g) + 3 H_2(g) rightar

Explanation / Answer

16) Ksp = 2.8 x 10-9

CaCO3   Ca+2  + CO3-2  

Ksp = 2.8 x 10-9 = x2

x = 5.3 x 10-5

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