UNIT 12 REVIEW

 

Part 1 Solubility Curves Use the solubility curve graph given with the Unit 12 materials to answer questions 1 - 4.

 

1. At what temperature does 135 grams of KI dissolved in 100 grams of water form a saturated solution?

Approx. 10oC

2. How many grams of KNO3 will dissolve in 400 grams of water at 60oC?
110 g KNO3 = x g x = 440 g
100 g H2O 400 g

3. If 10 grams of KClO3 are dissolved in 100 grams of water at 30oC, is the solution saturated, unsaturated, or supersaturated?

unsaturated

4. How many grams of solid precipitate will form if a saturated NaNO3 solution is cooled from 80oC to 20oC?

145 g 87 g = 58 g

Part 2 Concentration of Solutions

5. How many grams of Fe(C2H3O2)3 are needed to dissolve to make 350. mL of a 2.50 M solution?

2.50 M = x x = 0.875 moles Fe(C2H3O2)3 Fe: 1 x 55.8 = 55.8

0.35 L C: 6 x 12.0 = 72.0 232.8

H: 9 x 1.0 = 9.0
0.875 moles Fe(C2H3O2)3 x 232.8 g Fe(C2H3O2)3 = 204 g O: 6 x 16.0 = 96.0

1 mole Fe(C2H3O2)3


6. What is the molarity of a solution made by diluting 17.3 mL of 12 M hydrochloric acid to 550. mL?

12 M . 17.3 mL = M2 . 550. mL M2 = 0.38 M

Part 3 Solubility Write (s) or (aq) next to each product. Then, write the net ionic equation.

 

7. ___ Ca(NO3)2 (aq) + ___ Na2CO3 (aq) ___ NaNO3 ( aq ) + ___ CaCO3 ( s )

N.I.E. = Ca+2 (aq) + CO3-2 (aq)
CaCO3 (s)
Spectator Ions = Na+1 and NO3-1

 

8. ___ Zn(NO3)2 (aq) + ___ K3PO4 (aq) ___ KNO3 ( aq ) + ___ Zn3(PO4)2 ( s )

 

NIE = 3 Zn+2 (aq) + 2 PO4-3 (aq) Zn3(PO4)2 (s)
Spectator Ions = K+1 and NO3-1