Name: Date: Exp 1: Observations of Chemical Changes Lab Section: Data Tables: Part 1: Chemicals Well...

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

Expert Solution

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?

Answer : we can test the NaHCO3 by heating the sample it will evolve CO2 and will give NaOH.

The NaOH can be tested with phenolphthalein.

Also, it will give brisk effervesence with vinegar

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?

Answer:Bomothymol will turn yellow in presence of acid. so we can test vinegar by it

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?

Answer: If the sample turns pink on addition of phenolphathalein then it must contain some basic or alkaline solution .

It may be sodium bicarbonate or NaOH or any other base.

Remember phenolphthalein changes its colour to pink in basic medium.

D. You suspect dissolved silver ions in a solution. How would you test this solution to confirm the p

Answer: The presence of Ag+ can be determined by the addition of HCl as HCl will react with Ag+ to give precipitate of AgCl.

queen_honey_blossom answered 2 years ago

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