(02 Nov) Qns

Posted by Kyo on November 01, 2007 at 16:36:03:

In Reply to: Ans to (01 Nov) Qns posted by Kyo on November 01, 2007 at 16:14:47:

Q23 (02 Nov 07)
When chlorine is bubbled through an aqueous solution containing hydroxide and sodium bromide, bromide ions are oxidized to a bromine-containing oxyanion. Addition of aqueous silver nitrate to the resulting solution precipitates 4.31g of AgCl. When this ppt is filtered off, and more silver nitrate solution is added, 1.18g of a cream solid is produced. The solid had the following composition by mass : Ag 45.8%, Br 33.9%, O 20.3%.
Construct a balanced equation for the reaction between chlorine, sodium bromide, and sodium hydroxide.


Q24 (02 Nov 07)
Iodine and chlorine react together to form compound X which has the formula ICln (ie. n chlorine atoms per iodine atom). When 0.001 mol of X was reacted with excess KI (aq), all of its iodine was converted into I2. The iodine liberated required 40cm3 of 0.1 mol/dm3 sodium thiosulphate for complete reaction. Calculate the value of n, and hence write a balanced equation for the reaction between Cl2 and I2.


Q25 (02 Nov 07)

Q26 (02 Nov 07)
For the Haber process of manufacture of ammonia,
a) calculate the total pressure required at 673K to achieve 45% yield of ammonia at equilibrium given that Kp for this reaction at 673K is 2.18 x 10-6 atm-2.
b) calculate the total pressure at equilibrium where ammonia is 90% dissociated into its elements at 400 deg C.


Q27 (02 Nov 07)
Solution FA1 contains 10.3g of the acid, H2YO4 per dm3 of solution. Solution FA2 contains 1.7g of OH- ions per dm3 of solution. In a titration, 10.0cm3 of FA1 required 21.0cm3 of FA2 for complete reaction.
a) Calculate the molar mass of Y, hence identify Y.
b) Explain which is the stronger acid, H2YO3 or H2YO4.

Q28 (02 Nov 07)
Explain why reacting concentrated H2SO4 with the iodide ion may yield a mixture of H2S (g) and SO2 (g), while reacting concentrated H2SO4 with the bromide ion yields only SO2(g).

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