Put on the latex gloves.
Label eight of the plastic cups as follows:
1) Water (control)
2) Vinegar (control)
3) Water (4 hours)
4) Vinegar (4 hours)
5) 50 percent (4 hours)
6) Water (24 hours)
7) Vinegar (24 hours)
8) 50 percent (24 hours)
Fill each cup with 50 mL of the following liquids (using the graduated cylinder to measure):
1) Water
2) Vinegar
3) Water
4) Vinegar
5) 50% vinegar in water
Mix 25 mL of water with 25 mL of vinegar.
6) Water
7) Vinegar
8) 50% vinegar in water
Mix 25 mL of water with 25 mL of vinegar.
Place one lead sinker into cups 3 through 8.
Cover all eight cups with plastic wrap.
Store the cups in a place where they won't be disturbed.
Label three cups, as follows:
Water pH
Vinegar pH
50:50 pH
Add water, vinegar, or the 50 percent water, 50 percent vinegar solution to each of the cups, as labeled.
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Use the Ph test strips to test the Ph’s of the solutions.
After the lead sinkers have been in the solutions for 4 hours, test the solutions in cups 1–5.
Put on gloves and safety goggles.
Using the eyedropper, fill the plastic test tube from the lead testing kit about one-fourth of the way full with test solution from cup 1.
Activate a cotton swab from the kit by dipping it into the indicator (sulfide) solution.
Place the cotton swab into the test tube with the solution.
Cut the swab in half with scissors so it fits inside the tube, if necessary.
Put the cap back on and tip the tube over and back once to mix.
Wait one and a half minutes.
If there is lead in the solution, the solution and the swab will turn yellow, brown, or black in color.
If the solution and the swab stay clear, or become milky white, lead is not present in the solution.
Compare the color of the solution and the swab with the color key that was included with the lead testing
kit. Record the color of the solution and swab and the approximate lead concentration, in ppm. Pour out the solution from the test tube in a sink and wash it down with running water. Do not get the solution on your skin. Dispose of the used cotton swab. Rinse the test tube with water. Repeat steps 2–8 for the solutions in cups 2–5. After the lead sinkers have been in the solutions in cups 6, 7 and 8 for 24 hours, test the solutions. Put on gloves and safety goggles. Repeat steps 2–9 for the solutions in cups 6–8. Repeat the entire procedure two more times, with fresh materials and solutions, so that there is a total of three trials.
Rinse your beaker thoroughly to wash any excess powder. 12. Repeat steps 7-11 3 more times for reliability. To make sure the temperature still stays hot by continue heating the water a little bit using the hot plate. 13.
Each subsequent trial will use one gram more. 2.Put baking soda into reaction vessel. 3.Measure 40 mL vinegar. 4.Completely fill 1000 mL graduated cylinder with water.
7.) After you have heated them to the right temperatures, pour the excess water into a dry evaporating dish. ( Be sure not to get any of the substance in your solution. )
The procedure of the lab on day one was to get a ring stand and clamp, then put the substance in the test tube. Then put the test tube in the clamp and then get a Bunsen burner. After that put the Bunsen burner underneath the test tube to heat it. The procedure of the lab for day two was almost exactly the same, except the substances that were used were different. The
Put a label on each test tube. With a pencil, number each test tube from one to twelve.
2. Drop a gummy bear into each of your prepared beaker or cup and place the beaker or cup
How am I going to make it a fair test I will use a clean flask for
7. Using the stirring wire, stir the mixture until the solute completely dissolves. Turn the heat source off, and allow the solution to cool.
factors held constant – the door knob that was swabbed, time amount, petri dish, lighting, temperature
Plan 1. Collect 4 different sized beakers 2. Boil some water in the kettle 3. Pour 50ml into each beaker 4. After 1 minute check temperature 5.
2. In the large beaker, put water and boil it completely. After that, remove the beaker from heat. 3. Sample tubes (A-D) should be labeled and capped tightly.
Rinse a 25mL buret with three 5mL portions of standard permanganate solution. Fill the buret with the standard permanganate solution and record initial and final readings.
== § Test tubes X 11 § 0.10 molar dm -3 Copper (II) Sulphate solution § distilled water § egg albumen from 3 eggs. § Syringe X 12 § colorimeter § tripod § 100ml beaker § Bunsen burner § test tube holder § safety glasses § gloves § test tube pen § test tube method = == = =
tube. Add 6 mL of 0.1M HCl to the first test tube, then 0.1M KMnO4 and
stains on sputum’s and body fluids, and have completed a few AFB cultures. Apart from