Explanation:

Introduction:
The pH of a solution is a measure of its acidity or alkalinity. It is determined by the concentration of hydrogen ions (H+) in the solution. A higher concentration of H+ ions corresponds to a lower pH value, indicating a more acidic solution. Conversely, a lower concentration of H+ ions corresponds to a higher pH value, indicating a more alkaline or basic solution.

Equimolar Solutions:
Equimolar solutions refer to solutions that have equal molar concentrations of the solute. In this case, equimolar solutions of BaCl2, AlCl3, LiCl, and BeCl2 were prepared separately.

pH values of the substances:
To determine which substance will record the highest pH value, we need to consider the behavior of the substances in water and their ability to release H+ ions.

- BaCl2: When BaCl2 dissolves in water, it dissociates into Ba2+ ions and Cl- ions. However, neither the Ba2+ ions nor the Cl- ions react with water to release H+ ions. Therefore, the pH of the solution remains neutral, around 7.

- AlCl3: When AlCl3 dissolves in water, it undergoes hydrolysis. The Al3+ ions react with water to form Al(OH)3 precipitate and H+ ions. The release of H+ ions makes the solution acidic and lowers the pH.

- LiCl: When LiCl dissolves in water, it dissociates into Li+ ions and Cl- ions. However, neither the Li+ ions nor the Cl- ions react with water to release H+ ions. Therefore, the pH of the solution remains neutral, around 7.

- BeCl2: When BeCl2 dissolves in water, it undergoes hydrolysis. The Be2+ ions react with water to form Be(OH)2 precipitate and H+ ions. The release of H+ ions makes the solution acidic and lowers the pH.

Conclusion:
Among the given substances, BaCl2 does not release H+ ions when dissolved in water, resulting in a neutral pH around 7. On the other hand, both AlCl3 and BeCl2 undergo hydrolysis and release H+ ions, making the solutions acidic and lowering the pH. Therefore, BaCl2 will record the highest pH value among the given substances.

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