Question

Two solutions X and Y give red and blue colour respectively with universal indicator.

1. In which solution is the hydrogen ion concentration more than the other? Justify your answer.
2. If X and Y are mixed in proper amounts and the resultant mixture is tested with a universal indicator, it turns green. What is the nature of the salt formed? Justify your answer.

Answer 1

(i) Hydrogen ion concentration:

Solution X gives a red color with a universal indicator, which indicates it is a highly acidic solution. This is because a low pH corresponds to a higher hydrogen ion concentration (\( \text{H}^+ \)). Solution Y gives a blue color with a universal indicator, indicating it is a highly alkaline solution with a lower concentration of hydrogen ions.

(ii) Nature of the salt formed:

If solutions X (acidic) and Y (alkaline) are mixed in the right proportions, they neutralize each other. The fact that the resultant mixture turns green with a universal indicator signifies that the resultant solution is neutral (pH around 7). This indicates the formation of a neutral salt; a neutral salt is formed when a strong acid reacts with a strong base.