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Homework and Test Grade Recovery

Chapter 4: Aqueous Reactions and Solution Stoichiometry

Exercises: Sections 4.2: Precipitation Reactions and Net Ionic Equations


1. Define the following in terms of chemical reactions


(c) solubility




(a) precipitate





(b) precipitation reaction





2. List the common soluble and insoluble ions in water


Soluble Compounds

Soluble Exceptions

Insoluble

Insoluble Exceptions










































3. Predict whether each of the following compound is soluble (S) or insoluble (I) in water:



__________ a) K3PO4



__________ b) Pb(C2H3O2)2


__________ c) Ga(OH)2



__________ d) NaCN


__________ e) BaSO4





4. (a) What is a metathesis or exchange reaction?



(b) What is the general equation for a metathesis or exchange reaction?




(c) Write one example of a metathesis or exchange reaction. Use an example in which the metathesis

reaction is also a precipitation reaction.





5. Identify the precipitate (if any) that forms when the following solutions are mixed and write the balanced

equation for each reaction. If no precipitate forms, please write NONE.



a) Hg2(NO3)2 and KI _________________________







b) (NH4)2CO3 and CaCl2 _________________________








c) NaC2H3O2 and CuSO4 _________________________






6. Define the following:


(a) molecular equation






(b) complete ionic equation






(c) spectator ion






(d) net-ionic equation





7. Solutions of Pb(NO3)2(aq) and Na2SO4(aq) are mixed together.


(a) write the complete ionic equation







(b) identify the spectator ions: _______________________________




(c) write the net ionic equation









8. Solutions of CuBr2(aq) and NaOH(aq) are mixed together.



(a) write the complete ionic equation






(b) identify the spectator ions: _______________________________



(c) write the net ionic equation





8. Solutions of AgNO3(aq) and KI(aq) are mixed together.



(a) write the complete ionic equation






(b) identify the spectator ions: _______________________________



(c) write the net ionic equation





9. Separate samples of a solution of an unknown salt are treated with dilute solutions of HBr, H2SO4, and

NaOH. A precipitate forms only with H2SO4. Which of the following cations could the solution contain:

K+; Pb2+; Ba2+. Explain your answer.











10. Three solutions are mixed together to form a single solution. One contains 0.2 mol lead (II) acetate, the

second contains 0.1 mol sodium sulfide, and the third contains 0.1 mol of calcium chloride.


a) Write the net ionic equations for the precipitate reaction or reactions that occur.


5



2 PERIODO CIENTO TREINTA Y CUATRO DE
2 PERIODO NOVENTA Y CUATRO DE SESIONES
2 PERIODO NOVENTA Y TRES DE SESIONES


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