Pre-lab Questions for Experiment \#4 Chemical Reactions 1) Use the solubility table below for questions a and b. a) Select the ionic compound which is insoluble in water. A) AgCl B) Fe(NO)3 C) KBr D) MgCl2 E) NH4Br Answer: ( ) b) What is the precipitate that forms when solutions of Na2SO4 and Ba(NO3)2 are mixed? A) NaNO3 B) BaSO4 C) Ba2SO4 D) Na2NO5 E) Na2(NO3)2 Answer: ( ) 2) Which of the following will occur when solutions of CuSO4 (aq) and BaCl2 (aq) are mixed? A) A precipitate of CuCl, will form; Ba2 and SO42 are spectator ions. B) A precipitate of CuSO4 will form; Ba2+ and Clare spectator ions. C) A precipitate of BaSO4 will form; Cu2+ and Clare spectator ions. D) A precipitate of BaCl2 will form; Cu2+ and SO42 are spectator ions. E) No precipitate will form. Answer: ( C) 3) Balnnce the following equations: (a) NaHCO3Na2CO3+H2O+CO2 (b) Cu+HNO3Cu(NO3)2+NO+H2O (c) P4O30+H2OH3PO4