39. An aqueous solution of calcium hydroxide is standardized by titration with a

Question

39. An aqueous solution of calcium hydroxide is standardized by titration with a 0.124 M solution of perchloric acid. If 29.1 mL of base are required to neutralize 22.5 mlL of the acid, what is the molarity of the calcium hydroxide solution? 40. A 11.5 g sample of an aqueous solution of hydrobromic acid contains an unknown amount of the acid. If 26.1 mL of 0.534 M sodium hydroxide are req the hydrob uired to neutralize romic acid, what is the percent by mass of hydrobromic acid in the mixture? 8 sample of an aqueous solution of a nitric acid contains an unknown amount of 41. A 10.6 the acid. If 19.1 mL of 0.224 M barium hydroxide are required to neutr acid, what is the percent by mass of nitric acid in the mixture? 42. A 13.6 g sample of an aqueous solution of perchloric acid contains an unknown amount of the acid. If 14.8 mL of 0.304 M sodium hydroxide are required to neutralize the perchloric acid, what is the percent by mass of perchloric acid in the mixture? 43. Assign oxidation states to each of the elements in the compounds below a. Cu(OH)2 b. AgBr c. HNO d. H2SO3 e. SiO2 f. F2 g. NOF i. POCI 44. Identify the species oxidized, the species reduced, the oxidizing agent and the reducing agent in the following electron transfer reactions b, Br2 + Mn 2Br-+ Mn2+ 45. For the reaction: 2NO + 2Mn(OH), N20 + 2Mn02 + H20 + 20H- a. The oxidation state of manganese changes from what to what? b. How many electrons are transferred in the reaction? 46. For the reaction: a. b. The oxidation state of chlorine changes from what to what? How many electrons are transferred in the reaction? 47. For the reaction: a. The oxidation state of chlorine changes from what to what? b. How many electrons are transferred in the reaction? 48. Write the oxidation and reduction half-reactions for the following electron transfer reaction below. 2A9(s) + Cl2(g) 2A9(aq) + 2Claq)

Explanation / Answer

Ans 39

The reaction between perchloric acid and calcium hydroxide is given as :

2HClO4 + Ca(OH)2 = Ca(ClO4)2 + 2H2O

two moles of acid require one mole of base , according to the balanced reaction.

Number of moles of acid = 0.124 x 0.0225 = 0.00279 moles

So the number of moles of base required = (0.00279) / 2 = 0.001395 moles

Molarity of base = (0.001395) / 0.0291

= 0.048 M

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