Ch. 4, 13, 16.11, 24.1   solution, Lewis acid / base; complex ion                    test       75 points                      ap chemistry

Show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

                                                                                                Signature:  ___________________

1. Write the balanced net ionic equation for the formation of a complex ion from __.  [8 points]

a.  Zinc metal in concentrated hydrogen chloride

b.  Silver metal in concentrated ammonia

2.  In regards to the reaction:  boron trifluoride and ammonia.  [12 points]

a.  Write the chemical equation using the Lewis structures of the compounds and identify the coordinate covalent bond in the chemical(s) in the reaction.

b.  identify the Lewis acid and Lewis base in the above reaction.

c.  Define a Lewis acid and Lewis base.

3. Describe how to prepare 125 mL of a 275 mM glucose, C6H12O6, aqueous solution using ___; include calculations to justify your answer.  [10 points]

a.  Solid  glucose

b. 625 mM glucose solution.

4.  Write the balanced net ionic equation for __; if there is no reaction then write “no reaction”.  [9 points]

a. Mix aqueous solutions of sodium carbonate and hydrogen nitrate

b. Mix aqueous solutions of barium acetate and potassium phosphate

c.  Mix aqueous solutions of  lead (II) nitrate and lithium sulfate

5.  Excess sodium phosphate was added to a 25 mL aqueous solution of calcium nitrate forming 1.5 g of a precipitate.  What was the concentration of calcium ions in the solution prior to the addition of sodium phosphate ?  [15 points]

6. What is the volume of 25 mM H2SO4 to neutralize a 75 mL aqueous solution containing 3.0 g sodium hydroxide ? [15 points]

7. Old topic:   sketch 3 isomers of  C2H60.   [6 point]