CHEM 1010H Quiz: CHEM 1010H Lab 4 Solutions

I just had a lab on Identification Tes, but i ha some difficulty to understand. If possible can you please help me with this table?

A. Identification Tests

Materials: Three small beakers (100-150 mL), test tubes (6), test tube rack, stining rod,

50-mL graduated cylinder, test tube holder, droppers, boiling water bath, 1 % starch,

10% NaCl, 0.1 M AgN03, 10% glucose, Benedict's reagent, iodine reagent. Dropper

bottles ivith these reagents may be available in the laboratory.

In this experiment, you will perform the identification tests for c1-, glucose, and starch. To determine the

presence or absence of ci-, glucose, or starch in later experiments, refer to the results of the tests. For

each test, observe and record the initial properties of the reagent and the final appearance of the solution

after the reagent is added. In a positive test, there will be a change in the original properties of the

reagent, such as a color change and/or the formation of a precipitate (opaque solid). If there is no change

in the appearance of the reagent, the test is negative.

Caution: AgN03 and iodine reagent stain!

A.1 Chloride (Cr) test Place 3 mL of 10% NaCl in a test tube. Place 3 mL of distilled water in another

test tube. The test tube with the water will be the control or comparison sample. Test for ci- by

adding 2 drops of 0.1 M AgN03 to each. Record your observations. Compare the results for the

NaCl solution with the results for the water sample.

A.2 Starch test Place 3 mL of 1 % starch solution in a test tube. Place 3 mL of distilled water in

another test tube. Add 2-3 drops of iodine reagent to each. Record your observations. Compare the

results for the starch sample with the results for the water sample.

A.3 Glucose test Place 3 mL of 10% glucose solution in a test tube. Place 3 rnL of distilled water in

another test tube. Add 3 mL of Benedict's reagent to the glucose and to the distilled water. Heat

both test tubes in a boiling water bath for 5 minutes. Record your observations. Compare the results

for the glucose with the results for the water sample. Note: Each time you carry out the glucose

test, the test tubes containing Benedict's reagent must be heated in a boiling water bath.

Name: Date: Exp 1: Observations of Chemical Changes Lab Section: Data Tables: Part 1: Chemicals Well No. Observations of the Reaction A. NaHCO3 + HCl B. HCl + BTB C. NH3 + BTB D. HCl + blue dye E. Blue dye + NaOCl with the 1 drop of HCl F. NaOCl + KI with 1 drop of starch G. KI + Pb(NO3)2 H. NaOH + phenolphthalein I. HCl + phenolphthalein J. NaOH + AgNO3 K. AgNO3 + NH3 after exposure to bright light L. NH3 and CuSO4 Part F: Testing of Various Foods with the NaOCl + KI solution Foods Presence or Absence of Starch Part 2: Household Chemicals with Bromthymol Blue Use the empty pipet in the Auxiliary Supplies Bag to test several (at least 3) household items including household cleaning products with bromothymol blue. Rinse the pipet well before using it on the next household chemical. When finished with this experiment rinse the pipet well and return it to the Auxiliary Bag for use in future experiments. Name the items tested and record their results. Household Chemicals Well No. Observations of the Reaction Conclusion: Questions and Problems: A. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate, NaHCO3). How would you test this material for the presence of sodium bicarbonate? B. Looking at the household chemicals you tested with bromthymol blue, what can you deduce from the test results for each of the household chemicals? C. You found a sample of a solution that you think might be vinegar which is acidic. You are verifying that it is indeed vinegar and you add a few drops of phenolphthalein. The sample turns pink. What does that tell you about this sample? D. You suspect dissolved silver ions in a solution. How would you test this solution to confirm the p

I am doing an experiment on saponification. we conducted a hard water test at the end with 4 different test tubes. this experiment went as follows

"Hard Water Reactions.

Place about one-third spatula full of the soap you have prepared in a 50-mL beaker containing 25 mL of water.

Warm the beaker with its contents to dissolve the soap.

Pour 5 mL of the soap solution into each of 5 test tubes (nos. 1, 2, 3, 4, and 5).

Test no. 1 with 2 drops of a 5% solution of calcium chloride (5% CaCl2), no. 2

with 2 drops of a 5% solution of magnesium chloride (5% MgCl2), no. 3 with 2 drops of a 5% solution of iron(III) chloride (5% FeCl3), and no. 4 with tap water. The no. 5 tube will be used for a basicity test, which will be performed later.

Record your observations on the Report Sheet. "

OUR RESULTS ARE AS FOLLOWS

test tube #4 (water) : Solution turned an thick orange color, no transparency

Test tube #3 (iron III chloride): Solution turned an thick orange color, no transparency

test tube #2 (magnesium chloride): Solution turned an extremely cloudy color, no transparency

test tube #1 (calcium chloride): Solution turned a cloudy white color, solid particle was formed in the middle along with a few bubbles on the top

my question is, what do the results for each test tube mean? i am having trouble writing up my discussion. the full lab link is as follows: http://www.seattlecentral.edu/faculty/ptran/bastyr/Summer%2006/organic/Organic%20Exp/Experiment4Preparation%20and%20properties%20of%20a%20soap1.pdf