Chemistry Solution

While we refluxed the solution there was no color change, the solution stayed clear. After gravity filtration the solution stayed clear. After roto vap, solution was a milky brown color.

20) If the solid is still not dissolved, add a tiny amount of hexane and swirl again.

B1. Work under the hood! Weigh out exactly 0.1 g of ammonium dichromate and add to a test tube. Clamp and warm gently with a Bunsen burner. Two of the products of this reaction are chromium(III)oxide and nitrogen gas. Watch for evidence of the third product.

The first step that needed to be done in this experiment was adding hydrochloric acid (HCl)

Place 100 ml of distilled water in a 250-ml (or 400-ml) beaker. Add 1.26g of oxalic acid dihydrate (H2C2O4.2H2O) and 1 ml of concentrated ammonia. Stir the mixture until the solid has dissolved completely.

Then added 5.00g of CuCl₂ ●H₂O into the distilled water. Stirred to dissolve the mixture

8. Repeat step 7 with H2SO4, except that you should use a 10 mL graduated cylinder of H2SO4 and adding 15 mL water.

Mix 100 Milliliters of Salient Solution into one cup of water, 100 Milliliters of Glucose Solution in another, and put 50 Milliliters of Salient Solution and 50 Milliliters of Glucose Solution in another and mix it.

precipitate; then pour over the solid in the funnel. Finally, pour two 10-mL portions of

Discard the solution in the appropriate container as directed to you by your lab instructor.

3.0g of salicylic acid was weighed then 3.0mL of acetic anhydride and 6 drops of 85% H3PO4 were added to it. The mixture was warmed over a water bath for 5 minutes while stirring. After warming, 20 drops of distilled water was slowly added. 15mL of water was added then the solution was heated until it became clear. It was allowed to cool and was placed in an ice bath until the solution becomes cloudy. Using pre-weighed filter paper, the mixture was filtered and was allowed to dry in the filter paper.

Add to this 5 drops of pH 4 buffer solution * Measure out 2 cm³ starch solution * Start stopclock and leave for 1 minute * Measure out 1 cm³ amylase and place in second corvette * Add to this 2 cm³ distilled water *

The solution is stirred with a stirring rod and stopped as soon as the pink colour disappears.

After adding all four reactants and keeping the mixture cold a cloudy, white residue was present in the bottom of the flask.

Step 1 and 2 was repeated by using distilled water by replacing the test solution.