Which of these statements about the common-ion effect is most correct? a) The so

Question

Which of these statements about the common-ion effect is most correct? a) The solubility of a weak ionizing salt MA is decreased in a solution that already contains either M or A b) Common ions alter the equilibrium constant for the reaction of an ionic solid with water. c) The common-ion effect does not apply to unusual ions like SO^2_3. d) The solubility of a salt MA is affected equally by the addition of either A^- or a non-common ion. The accompanying diagram shows how entropy varies with temperature for a substance that is a gas at the highest temperature shown. (a) What process correspond to the entropy increases along the vertical lines labeled 1 and 2? (b) Why is the entropy change larger for 2 than that for 1? At 900 degree C titanium tetrachloride vapor reacts with molten magnesium metal to form solid titanium metal and molten magnesium chloride. (a) Write a balanced equation for this reaction. (b) What is being oxidized and what is being reduced? (c) Which substance is the reductant, and which is the oxidant?

Explanation / Answer

3)

Most correct is a

b is wrong because common ions doesn’t alter equilibrium constant. Equilibrium constant depends only on temperature

c is wrong because common ion effect can apply to any ions

d is wrong because solubility of MA is not effected by adding common ions

Answer: a

4)

a) Both process corresponds to increasing entropy as arrow is pointed up in both the cases

b) Length of arrow determines the entropy change. Since length of arrow 2 is large, the entropy change is large for 2

5)

a)

TiCl3(g) + Mg (aq) —> Ti (s) + MgCl2 (aq)

Now lets balance it,

2TiCl3(g) + 3Mg (aq) —> 2Ti (s) + 3MgCl2 (aq)

b)

Mg is oxidised form 0 oxidation state in Mg to +2 in MgCl2

Ti is reduced from +3 oxidation state in TiCl3 to 0 in Ti

c)

Since Mg is oxidised, it is reducing other substance.

Mg will be reductant

Since Ti in TiCl3 is reduced, it is oxidising other.

So, TiCl3 is oxidant

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