We dissolve 2.66 g of an unknown acid, HA, in enough water to produce 25.0 mL of solution. The pH of this solution is 1.44. We titrate this solution with a 0.250 M NaOH solution and we need 33.3 mL of this 0.250 M NaOH solution to reach the equivalence point. The temperature is 25.0 ◦C throughout. (a) What is the molar mass of HA? (b) What is the dissociation constant, Kb, of A−(aq)? (c) What would be the pH of a 2.222 M solution of A−(aq)?

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.