Suppose a solution contains 0.7 M Ba2+ (aq) and 0.4 M Mg2+ (aq). Fluoride ions, F- , are then slowly added to the solution.  Calculate the [Mg2+] left in solution when Ba2+ starts to precipitate, and then answer the following question. What percent of the original Mg2+ is left in solution when Ba2+ starts to precipitate? a. 3.5 x 10-5 % b. 6.8 x 10-2 % c. 6.8 x 10-4 % d. 3.5 x 10-7 % e. 2.7 x 10-2 %   Tables.pdf Periodic Table with New Elements.pdf

The correct formula for Mercury(I) bicarbonate is:   a. Hg2HCO3 b. Hg2(CO3)2 c. HgHCO3 d. Hg2(HCO3)2 e. Hg(HCO3)2

Suppose you start with a solution that is at pH 8. If enough acid is added to make the [H+] 1000 times larger, what is the new pH? (Hint: Although this problem can be done using a calculator, it can easily be done in your head if you understand the principle.)   a. 3 b. 4 c. 7 d. 11 e. 5

The equilibrium 4 equation for the formation of the complex Cd(CN)42- is: Cd2+ + 4CN-    ⇌  Cd(CN)42- Write the equilibrium constant expression Kf , and then answer the following question. If Cd(CN)42- is a “typical” complex (which it is), which of the following statement(s) would you expect to be true? 1. At equilibrium, there will be more Cd2+ and CN- than Cd(CN)42- 2. At equilibrium, there will be more Cd(CN)42- than Cd2+ and CN- 3. The Kf value is small (- power of 10) 4. The Kf value is large (+ power of 10)   a. 2 and 4 only b. 1 and 3 only c. 1 and 4 only d. 2 and 3 only e. 2 only   Tables.pdf Periodic Table with New Elements.pdf

Classify HClO4 as a strong acid, weak acid, strong base, or weak base, and then answer the following question. What is the pH of 8.2 x 10=4 M HClO4 (aq)?   a. 17.1 b. 10.9 c. 2.5 d. 3.1 e. 7.1

Suppose that a chemist runs the following reaction with initial pressures as shown:

What is the correct name of NO2- ?- a. nitride b. nitrate c. nitrogen trioxate d. nitrite e. nitrogenoxite

What is the correct formula for Aluminum oxide?   a. AlO2 b. Al2(O2)3 c. AlO d. Al2O3 e. Al2O

What is the pH of 0.05 M ClO- (aq) from the previous problem.   a. 9.59 b. 3.89 c. 10.11 d. 12.70 e. 4.41

Classify NH3 as a strong acid, weak acid, strong base, or weak base, and then answer the following question. What is the pH of 1.17 M NH3 (aq)?   a. 4.59 b. 11.66 c. 2.34 d. 9.41 e. 9.25