CHM116 Lab 6: Anions and Cations Pre-Lab Quiz

When excess NaOH(aq) is slowly added to a solution containing aluminum ion, a precipitate forms at first but then re-dissolves. What is the formula for the aluminum product after excess NaOH has been added?

Al(OH)4−(aq)

Use the solubility rules in your handout to determine which of the following compounds is insoluble (not soluble) in water.

Cu(OH)2

An aqueous solution is known to contain Ag+ and Cu2+ ions. Based on the solubility rules in your handout, which of the following reagents could be added to separate these two ions?

HCl(aq)

Which of the following acids will NOT react with any of the following ions: Ag+, Pb2+, Cu2+?

HNO3

Which of the following should react with barium nitrate, Ba(NO3)2(aq), to form an insoluble solid (a precipitate)? Use the solubility rules.

Na3PO4

A reaction will NOT occur when all the reactants and products in the ionic equation are spectator ions because no change occurs such as the formation of a precipitate or molecular compound. Which of the following combinations (as reactants) will NOT undergo chemical change when mixed? Use Solubility Rules if needed.

NaCl(aq) and Fe(NO3)3(aq)

When aqueous solutions of lead(II) nitrate and potassium iodide are mixed, what is the formula for the insoluble solid (precipitate) that forms? Use Appendix J.

PbI2(s)

What are the main goals of this investigation?

Separation and identification of ions in solution