A student titrates 25.0 mL of 0.100 M hypochlorous acid, HOCl (a weak monoprotic acid, )
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A student titrates 25.0 mL of 0.100 M hypochlorous acid, HOCl (a weak monoprotic acid, Ka=3.5×10−8), with 0.100 M NaOH. After the equivalence point has been reached, an additional 2.00 mL of the NaOH solution is delivered.
Answer the following in a well-organized, clearly labeled response.
(a) List all ionic and molecular species that are present in appreciable amounts in the reaction mixture immediately after the extra 2.00 mL of base has been added.
(b) Identify the species that governs the numerical value of the pH at this stage and provide a qualitative justification for your choice.
(c) Describe the sequence of conceptual steps you would follow to obtain the pH numerically, without performing the actual calculation.