11. Indicate whether an aqueous solution of the following compounds is acidic, n

Question

11. Indicate whether an aqueous solution of the following compounds is acidic, neutral, or basic (NEN, NPC). a) (3) KClO3. b) (3) FeBr3 - 12. NEN and NPC for this question. Answers a) (3) Identify the predominant form of carbonic acid present in a solution buffered at pH = 7.40. b) (3) Identify the predominant form of hypochlorous acid present in a solution buffered at pH = 6.15. 13. Calculate the pH of 25.0 mL of a 0.200 M solution of diethylamine at the points in its titration with 0.100 M HCl when the following amounts of the HCI have been added: a) (4) 25.0 mL HCI Answer: Calculations:

Explanation / Answer

11.a) basic, ClO3- is anion of a strong acid HClO3 hence don't hydrolyse, so K hydrolses to give KOH a strong base.

b) acidic, in FeBr3 Br don't hydrolyse as its anion of a strong acid HBr. Hence Fe hydrolyse to produce Fe(OH)3+ H+ hence acidic

12. Predominantly HCO3- is found at ph 7.4 the basic ph ( due to deprotonation of H2CO3)

Predominantly HOCl is found along with some OCl- ions

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