Question

1. In this experiment you will doqualitative analyses to determine the identity of unknowncompounds.
What does qualitative analysis mean?

What doesquantitative analysis mean?

2. Use the flow chart to answerthe following questions (A-E).
A. Which non-water-solublecompound produces bubbles of gas when vinegar is added?

B. Which two water-solublecompounds produce bubbles of gas when vinegar isadded?
C.Carefully examinethe chemical formulas of the three compounds you just namedabove.

What ion do allthree have in common? Be sure to include the correct charge on theion.

D. Suppose that you are workingwith a water-soluble unknown which does not produce a bright pinkcolored solution when phenolphthalein is added. Based on thisresult, which of the unknowns might you have? (list all possibleidentities)

E. After getting the results ofthis phenolphthalein test (no pink color; part D), which testshould you perform next to narrow down the list of possibleidentities for your unknown?

3. It is very important not to usetoo much of the unknown compound when carrying out thewater-solubility test. Suppose you are working with an unknown thatis actually soluble in water: you take a sample of the unknown thatis too large (larger than the amount specified in the experimentalprocedure) and add some water. What do you think willhappen?