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Unformatted text preview: In which direction will the reaction proceed?
8. On the basis of the equation ph = - log [H+], the pH of 10-8 mol dm- solution of HCI
should be 8. However, it is observed to be less than 7.0. Explain the reason.
9. pH of a solution of a strong acid is 5.0. What will be the pH of the solution obtained after
diluting the given solution a 100 times?
10. A sparingly soluble salt gets precipitated only when the product of concentration of its ions
in the solution (Qsp) becomes greater than its solubility product. If the solubility of BaSO4
in water is 8 x 10"* mol dm . Calculate its solubility in 0.01 mol dm" of H2504.
11. pH of 0.08 mol dm HOCI solution is 2.85. Calculate its ionisation constant.
12. Calculate the pH of a solution formed by mixing equal volumes of two solutions A and B of
a strong acid having ph = 6 and pH = 4 respectively.
13. The solubility product of Al (OH); is 2.7 x 10-11. Calculate its solubility in gL- and also find
out ph of this solution. (Atomic mass of Al = 27 u).
14. Calculate the volume of water required to dissolve 0.1 g lead (II) chloride to get a
saturated solution. (Ksp of PbCl2 = 3.2 x 10-8 , atomic mass of Pb = 207 u).
15. A reaction between ammonia and boron trifluoride is given below:
: NH3 + BF3 - H3N : BF3
Identify the acid and base in this reaction. Which theory explains it? What is the
hybridisation of B and N in the reactants?
16. Following data is given for the reaction: CaCO;(s) - CaO (s) + CO2(g)
Af He [CaO(s)] = - 635.1 kJ mol-1
Af He [CO2(g)] = - 393.5 kJ mol-1
Af He [CaCO3(s)] = - 1206.9 kJ mol-1
Predict the effect of temperature on the equilibrium constant of the above reaction....
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