Which of the following ions will increase the acidity of a solution?

Which of the following ions will increase the acidity of a solution?

Step 1: Understand what acidity means. Acidity refers to how much a solution can donate protons (H+ ions).
Step 2: Identify the ions given in the question. We are looking for ions that can increase the number of H+ ions in the solution.
Step 3: Recognize that NH4+ (ammonium ion) is formed from NH3 (ammonia), which is a weak base.
Step 4: Know that when a weak base like NH3 accepts a proton, it forms NH4+, which can then donate protons back to the solution.
Step 5: Conclude that since NH4+ can donate protons, it will increase the acidity of the solution.

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