Question

1. You are given four acid solutions of different concentrations (i) 0.1 M (ii) 0.25 (iii) 0.05 and (iv) 0.01M. Which one is (a) the most concentrated and (b) the least concentrate

Answer 1

According to law of handerson equation, molarity is inversely related to acidity, so 0.1M is least acidic and 0.05 is concentrated

Answer 2

(a) The most concentrated acid is (ii) 0.25M

(b) The least concentrated is (iv) 0.01M

• The concentration/strength of an acid depends on the number of Hydronium ions present in its solution.
• The more the number of H⁺ or H₃O⁺ ions in the solution, the more concentrated is the solution.
• The molarity of a solution gives the number of moles of the solute present per 1 L of the solution.
• The more the amount of solute present in the solution, the more ions will be present in it.
• Thus the concentration of acids ∝ The molarity of the solutions.
• The order of concentration is: 0.25M > 0.1M > 0.05M > 0.01M