7 AP Question Answers

A 20.0 mL samplw of .200 molar K2CO3 solution is added to 30 mL of .400 molar Ba(NO3)2 solution. Barium carbonate percipitates. The concentration of barium ion, Ba, in solution after the reaction is

.160M

A 1.0 L sample of an aqueous solution contains .10 mol of NaCl and .10 mol of CaCl2. Which is the minimum number of moles of AgNO3 that must be added to the solution in order to precipitate all of the Cl as AgCl

.30 mol

a .20 mol sample of MgCl2 (s) and a .10 mol sample of KCl(s) are dissolved in water and diluted to 500mL. What is the concentration of Cl in the solution?

1.0 M

Beaker X and beaker Y each contain 1.0 L of solution, as shown above. A student combines the solutions by pouring them into a larger, previously empty beaker Z and observes the formation of a white precipitate. Assuming that volumes are additive, which of the following sets of solutions could be represented by the diagram above?

2.0 M AgNO3, 1.0 M MgCl2, .50 M Mg(NO3)2 and AgCl

a student mixes dilute AgNO3 with excess NaCl to form AgCl, as represented by the net ionic equation above. Which of the diagrams below best represents the ions that are present in significant concentrations in the solution?

C) 2Cl, 4Na, 2 NO3

A .10 M aqueous solution of Sodium Sulfate, Na2SO4, is a better conductor of electricity than .10 M aqueous solution of sodium chloride, NaCl. Which of the following best explains this observation?

More moles of ions are present in a given volume of .10 M Na2SO4, than in the same volume of .10 M NaCl

When a student prepares an aqueous solution containing the five cations Ag, Hg, Cu, Mn, and Ba, the student observes that no precipitates form in the solution. Which of the following could be the identity of the anion in the solution?

NO3