Question

-8- A student conducted a number of tests on a solid mixture, X. The inferences made are recorded in Table 2. Complete Table 2 by filling in the observations based on the inferences made. TABLE 2: TESTS ON MIXTURE X Test Observation Inferences (a) Distilled water was added to a portion of X and the resulting mixture stirred and filtered. (The residue was set aside for use later.) The filtrate was divided into 3 equal portions and tests (b) to (d) done on separate portions. Clions are present. (b) Dilute nitric acid followed by a few drops of silver nitrate solution was added. Ammonium hydroxide solution was added to the resulting mixture. An oxidizing agent is present. (c) A few drops of potassium iodide solution were added. Iron(III) ions are present. Aqueous sodium hydroxide was added until in excess. Carbonate ions are present. (e) Dilute nitric acid was added to the residue from test (a) and the gas produced passed through lime water. Total 1 •Pet (3 marks) (2 marks) (2 marks) (3 marks)

Answer 1

There would be a change in the color of the potassium iodide from yellowish-brown to colorless

Step-by-step explanation:

Here, we want to test for the presence of oxidizing agent by the use of potassium iodide

Since we already have the inference, we need to state what would be observed

Potassium iodide itself is a reducing agent

Thus, it becomes oxidized

In the process of being oxidized, there would be a color change

The color change observed will be from yellowish-brown to colorless