Ch. 15.  solution                                 test                   55 points                                  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.  How to prepare a 125 mL of 275 mM glucose, C6H12O6 using …  [10 points]

a. Solid glucose

b.  365 mM aqueous solution of glucose

2.  A 275 mL aqueous solution contains 5.0 g glucose.  [10 points]

a.  What is the % glucose ?

b.  What is the molarity of glucose in the solution ?

3. Excess sodium carbonate, Na2CO3, was added to a 125 mL aqueous solution of silver nitrate, AgNO3 that form 1.0 g of a precipitate.  What was the concentration of silver ion prior to the addition of the sodium carbonate ?  [10 points]

4.  175 mL H3PO4 was titrated by 25 mL of 275 mM KOH; what is the [H3PO4] ?  [10 points]

5. 75 mL of 125 mM silver nitrate was mixed with 85 mL of 135 mM sodium hydroxide to form  __ g of a precipitate.  [15 points]