6. Zinc Sheet: a rectangular, thin, sheet like metal, gray/silver. 6 5 4 3 2 1 * Solubility of solid iodine; 1. Solid iodine in 1 mL of water is slightly soluble, because the solution turns into a light brown/yellow color. However majority of the solid Iodine was left at the bottom of the test tube; which leads to the conclusion that it’s not reactive on water.
Also white & dark backgrounds are alternatively placed underneath the well plate for observing the mixture. Then the information is recorded into data book. Data Table 1: Reactions Expected Well # Chemicals Reaction A1 NaHCO3 and HCI - C02 Clear bubbles/bleach smell formed. No color change. A2 HCI and BTB Turned to amber orange A3 NH3 and BTB Turned to dark blue A4 HCI and blue dye Turned to green A5 Blue dye and NaOCI Color stays blue and not change until 1 drop of HCl added then color turned to light yellow A6 NaOCI and KI Turned from dark yellow to light yellow.
| | | | | | Bin | Paper towel bin is clean/emptied | | | | | | Steps | Toilet steps are clean and in a good condition. (no damage, non-slip/skid design are working properly) | | | | | | Wall | Evacuation plan and Emergency procedures are displayed. | | | |
Pretty Colors Lab Background: In the pretty color lab I will be showing the effects of diluting a strong acid and strong alkali on the pH. The pH scale measures how acidic or basic a substance is, indicated by what is called an indicator. The pH scale varies from 0 to 14, below 7 being acidic, above 7 being basic, and 7 being neutral. There will be three different indicators used in the lab, Phenolphthalein, Universal, and Cabbage juice. Each of these indicators will be used to show the various colors created when diluting the acids and bases.
3 The vinegar has a stronger scent than the water and appeared to have a slight change in color but not too noticeable. 4 The laundry detergent was green and cloudy and had a fresh fragrance to it. 5 Beaker 1 contents of 100 ml of water from beaker 1 was mixed with 60 ml of soil through the cheesecloth and it turned light brownish and smelled of soil. All of the water did not pass through the soil though only 70 ml did. 6 Beaker 2 contents of 100 ml of water and 10 ml of oil was poured through a cheesecloth and the water became dark brown, but there was no evidence of oil present in the soil.
Solutions 1,2,3,5 and 7 could not possibly be in unknown I because when Blom thymol is added to unknown I it turn blue but when blom thymol was added to solutions 1,2,3 and 5 turn yellow and solution 7 turn green. 5. For what practical application can Brom thymol blue be used for in the chemistry lab? Brom thymol blue is used in solutions to identify the pH profile of the unknown substance. Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic.
Powder B, when water was added, it only became watery. When vinegar was added, the liquid sunk to the bottom and none of the outcomes changed. With iodine, it had a color change with some bubbles but shortly after it went back and stayed the color brown. Powder C, it was not affected by water but by vinegar, it changes into bubbles and fizzes up and has a chemical reaction. With iodine it changes to a brown color and becomes clumpy.
Manganese dioxide is an inorganic molecule that can achieve this. The catalyst lowers the activation energy of the decomposition which is already noticeable without the addition of a catalyst. In our lab we observed that the Manganse dioxide had no effect on the reaction, however it should have a significant
Next, Zinc and Copper Sulfate combined which there was gas bubbles and the color changed into blue green color. Later, when Hydrochloric Acid was being combined gas
Southside Seaweed Seaport Iodine: Atomic Number: 53 Atomic Mass: 126.90447 Boiling Point: 457.4 K (184.3 °C, 363.7 °F) Focus: Did we indeed make a “tincture of iodine”? Answer: Yes, our lab experiment did indeed prove that we make a “tincture of iodine”. Test Standard (+/-) Comments Lab-Made Tincture (+/-) Comments Test for Iodine (I2) + purple layer formed + turned purple shade Test for Iodide (I-) + yellow precipitate + white-yellow precipitate Test for Triiodide (I3-) + orange/red coloration + orange/red coloration table 1.0 Confidence Report: 1. Matching the Standard Ran three tests against our home-made “tincture of iodine” versus the standard “tincture of iodine”. Each test (for Iodine (I2), for Iodide (I-), and for Triiodide (I3-)) match the standard for each reactant (I2, I-, I3-).