If the pH value of a salt solution is 7, most likely this is a solution of:

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Multiple Choice

If the pH value of a salt solution is 7, most likely this is a solution of:

When a salt dissolves and the solution is neutral (pH about 7), it typically comes from a salt formed by a strong base and a strong acid, so neither ion hydrolyzes water to change the pH. Potassium chloride (KCl) is made from potassium hydroxide (a strong base) and hydrochloric acid (a strong acid). In water, K+ and Cl− don’t react with water, so the solution stays essentially neutral. Others behave differently because of hydrolysis. Sodium carbonate (Na2CO3) yields carbonate ions that react with water to form OH−, making the solution basic. Potassium cyanide (KCN) provides cyanide ions that also generate OH− in water, giving a basic solution. Ammonium chloride (NH4Cl) releases ammonium ions, which donate protons to water and create a slightly acidic solution.

When a salt dissolves and the solution is neutral (pH about 7), it typically comes from a salt formed by a strong base and a strong acid, so neither ion hydrolyzes water to change the pH. Potassium chloride (KCl) is made from potassium hydroxide (a strong base) and hydrochloric acid (a strong acid). In water, K+ and Cl− don’t react with water, so the solution stays essentially neutral.

Others behave differently because of hydrolysis. Sodium carbonate (Na2CO3) yields carbonate ions that react with water to form OH−, making the solution basic. Potassium cyanide (KCN) provides cyanide ions that also generate OH− in water, giving a basic solution. Ammonium chloride (NH4Cl) releases ammonium ions, which donate protons to water and create a slightly acidic solution.

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