With reference to collision theory account for the colour change that occurred when HCl was added to K2CrO4 (Cromate)

To explain the color change that occurred when HCl was added to K2CrO4 (chromate), we can apply the principles of collision theory, which is a concept in chemistry that explains how chemical reactions occur.

In the collision theory, it is stated that for a reaction to occur, particles must collide with sufficient energy and proper orientation. In this case, we have two reactants: HCl (hydrochloric acid) and K2CrO4 (potassium chromate).

When HCl is added to K2CrO4, a chemical reaction takes place. The hydrogen ion (H+) from HCl reacts with chromate ion (CrO4^2-) in K2CrO4. The reaction can be represented as follows:

2HCl + K2CrO4 → 2KCl + CrO4 + H2O

Now, let's focus on the color change. K2CrO4 is a yellow-colored compound because it contains the chromate ion (CrO4^2-), which has a yellow color. However, when HCl is added, the yellow color disappears and is replaced by red.

This color change can be explained by the formation of a new compound, chromium chloride (CrCl2). When HCl reacts with K2CrO4, it causes the chromate ion (CrO4^2-) to further react and form the chloride ion (Cl-) instead. This reaction removes the chromate ion responsible for the yellow color, resulting in a color change to red.

It is important to note that the details of the reaction, including the exact mechanism and the concentration of the reactants, can affect the intensity and final color of the solution. However, the fundamental explanation for the color change can be attributed to the alteration of the chemical species responsible for the color in the original compound.

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