Results

Date: 2015-10-07; view: 427.

Experiment 1

After mixing deep yellow iron solution with light yellow iodide solution, reddish brown solution formed. After adding starch, colour of the solution turned to deep black blue.

Experiment 2

After mixing almost colourless NaOCl solution with light yellow FeSO₄ solution, brown coloured solution formed. pH of the solution was basic; in the test for Fe³⁺ with use of ammonium thiocyanate, result was positive – bubbles on the top of the solution could be seen.

Experiment 3

After mixing almost colourless NaOCl solution with colourless KBr solution, colourless solution was formed. pH of the solution was basic. After adding few drops of H₂SO­₄, colour became light yellow and pH was approximately 7. When kerosene was added, it went to the top of the solution and gained light yellow colour.

Experiment 6

After mixing almost colourless NaOCl solution with colourless KI solution, light yellow solution was formed. When starch was added, the colour of the solution turned to dark blue.

Experiment 7

After mixing NaOCl with H₂O₂, a lot of bubbles produced in the test tube. After, glowing splint was held inside of the test tube and flashes produced on the splint.

Experiment 8

After mixing colourless solutions of KI and H₂SO_4, colour of the formed solution did not change. But after putting H₂O₂ to the test tube, colour changed to reddish brown, then it precipitated and colour vanished. And after mixing the solution with kerosene, kerosene gained red colour.

Experiment 9

After adding hydrogen peroxide to manganase, oxygen gas evaporated and water remained.