Chemical Reaction and General College Chemistry

Topics: Chemical reaction, Chlorine, Acid Pages: 4 (980 words) Published: July 20, 2014
Title: Chem Lab #1: Observations of Chemical Changes

Procedure:
1. Using the 96-well plate, use a different well for each combination of reactions. Put 2 drops of the first chemical in one well and then 2 drops of the second chemical. Observe each reaction with both a white and black background 2.

NaHCO3 (sodium bicarbonate-baking soda) and HCl (hydrochloric acid). The bubbles formed are carbon dioxide (General College Chemistry, 2014, pp. 17-18).

A. HCl and BTB (bromothymol blue). Bromothymol blue is one of many acid-base indicators. What color do you observe? (General College Chemistry, 2014, pp. 17-18).

B. NH3 (ammonia, a base) and 1 drop of BTB. What color do you observe? Record the color you expect when BTB reacts with and acid and with a base (General College Chemistry, 2014, pp. 17-18).

C. HCl and blue dye (General College Chemistry, 2014, pp. 17-18).

D. Blue dye and NaOCl (sodium hypochlorite). Observe then add 1 drop of HCl (General College Chemistry, 2014, pp. 17-18).

E. KI (potassium iodide) and Pb(NO3)2 (lead nitrate). Describe the precipitate formed (General College Chemistry, 2014, pp. 17-18).

F. NaOH (sodium hydroxide- a base) and phenolphalein. Phenolphthalein is another acid-base indicator. What color do you observe? (General College Chemistry, 2014, pp. 17-18).

G. HCl and phenolphthalein. What color do you observe? When reacting phenolphthalein with an acid what color change do you expect? What color change do you expect with a base? (General College Chemistry, 2014, pp. 17-18).

H. NaOH and AgNO3 (silver nitrate) (General College Chemistry, 2014, pp. 17-18).

I. AgNO3 and NH3 (ammonia). Absorb this mixture onto a scrap of paper towel and expose it to intense light from a light bulb or the sun. Be patient and you will observe a change. Record your observation (General College Chemistry, 2014, pp. 17-18).

J. NH3 and CuSO4 (copper (II) sulfate) (General College Chemistry, 2014, pp. 17-18).

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