19. What is the final concentrations of C2O42- (aq) in a solution prepared by adding 0.100 L of 0.200 M K2C2O4 to 0.150 L of 0.250 M BaBr2? (For BaC2O4, Ksp = 2.3 × 10-8 ) (A) 3.3 × 10-7 M(B) 1.5 × 10-19 M(C)0.07000 M(D) 0.300 M (E)0.160 M

16. Consider the following solutions: 0.010 m Na3PO4 in water; 0.020 m CaBr2 in water; 0.020 m KCl; 0.020 m HF in water (HF is a weak acid). Assuming complete dissociation of the soluble salts, which salt dissolved in water would have the highest vapor pressure at 28℃? (A) 0.010 m Na3PO4(B) 0.020 m CaBr2(C)0.020 m KCl(D) 0.020 m HF (E)They all have the same vapor pressure

19. What is the final concentrations of C₂O₄^2-(aq) in a solution prepared by adding 0.100 L of 0.200 M K₂C₂O₄ to 0.150 L of 0.250 M BaBr₂? (For BaC₂O₄, K_sp = 2.3 × 10^-8 )
(A) 3.3 × 10^-7M
(B) 1.5 × 10^-19 M
(C)0.07000 M
(D) 0.300 M
(E)0.160 M

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