Investigating Chemical Reactions

Reaction 3- 1. Obtained a clean and dry test tube and placed a small amount ( about the size of a jelly bean) of ammonium carbonate into the test tube.

3. Under a fume hood, drops of concentrated HCl(aq) were added to each test tube.

place 5ml of catalase at 100u/mol into 4 test tubes and set one in each water bath

Fill a test tube about 1/3 full with cold tap water for use in step 34.

Next prepare the third test tube with an accurate measurement of 5ml sodium carbonate once again labelling appropriately.

14. Using the well D1 pipet, add two drops of the HCI to the well A1 buffer.Use a toothpick to stir the solution.

4.Measure 35mL of warm water and add them into each of the 4 test tubes at about roughly the same time. It is essential that the water is warm. Do not seal the test tube.

Repeat steps 4–11 two more times. Be sure to record your observations in the data tables in your lab notebooks, in the rows for trials 2 and 3. (Can you separate the dyes of grape soda using space sand?). The entirety of the Procedures.

Practiced holding the empty test tube with gloves and sliding the test tube into the Erlenmeyer flask, and sealed the flask with the stopper. 3. Took 5mL of sodium hydroxide in the

Instead of starting with 3mL start with 6mL. Transfer half of it to a second test tube and then dilute it with an equal amount of dilutent (water). Mix it thoroughly. The concentration of this solution will be half that of the full strength solution. The solution in the third tube will have half of the concentration in the second tube and ¼ the concentration of the full strength. Repeat this procedure until you reach 1/8.

Fill each test tube with 4 mL of water and 4 mL of 3.0% H_2 O_2. Make sure the pH of each solution is the same using the pH strips.

Marked a line on the test tube at the liquid level, repeated this step for test tubes 1,3,5,7,9 and 11.

Using a graduated cylinder measure out 10ml of the 5% sugar solution, add the solution into each test tube

Collect to 2 large beakers both large beakers are to be filled with hot water (labtutor). Then obtain seven conical tubes these will be used to collect the levels of gas, you will also need test tube a stopper and a plastic tube (labtutor). You want to fill the conical tube to at least 50 ml of water (Cressy). Take the four conical tubes filled with water and place two in each beaker, to do this you must invert the tube and cover the release hole as to not lose any water (Cressy). Then place the beakers with the tubes in the bath so they can be at the same temperature as the bath (Cressy). Next mark all of your test tubes in number order to be sure which tube contains what concentrations and pH (Cressy). Having mixed a solution to the specifications of 2.5 ml of glucose in all tubes, 3 ml of yeast in 2 tubes of pH 5, 2 tubes of pH 9, and the single pH 7 tube, the remaining two tubes will contain no yeast as they will be negative controls. Next add 2 ml of pH buffer 3 tubes will receive pH of 5, three will receive a pH of 9 and a single tube of pH 7. Finally add pure water to make sure all test tubes have 10 ml of solution. When making the solutions

add one drop to the other test tube of that pair, which has the same