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WorksheetsIONIC EQUILIBRIA 2
Total questions: 15
Worksheet time: 8mins
1. Which reaction is NOT Lewis acid-base reaction?
C+O2→CO2
BeF2+2F−→BeF42−
NH3+BF3 →H3NBF3
(C4H9)3N+SO3 → (C4H9)3NSO3
A solution of weak acid, HA 0.2 M ionises 1.8%. Calculate the value of Ka for this acid.
3.6x10-5
1.8x10-5
0.9x10-5
6.5x10-5
What is meant by salt hydrolysis?
The producing of cation and anion from the reaction between strong base and strong acid.
Salt hydrolysis occurs when any soluble salts dissolve in water
The producing of cation and anion from the reaction between weak acid and weak base.
Salt hydrolysis occurs when there is a reaction between cation, or anion or both and water.
Each of the following pairs of substances form(s) buffer solution(s) EXCEPT
NaH2PO4(aq) + Na2HPO4(aq)
NH3(aq) + NH4Cl(aq)
HCl(aq) + NaCl(aq)
Choose the correct statement about ethanoic acid with a concentration of 2.0x10-3 M.
Its pH is 2.7
H3O+ concentration is 1.9x10-4 M
The acid ionised completely in the aqueous solution
The Ka value increases with increasing concentration of the acid.
Which of the following salts forms an aqueous solution with the lowest pH value?
NH4NO3
KCl
Ca(NO3)2
Mg(NO3)2
For a titration between sulphuric acid and an aqueous solution of ammonia, the most suitable indicator used is
ethyl red 4.5-6.5
phenol red 6.7-8.5
phenolphthalein 8.3-10.0
alizarin yellow 10.1-12.0
Choose the appropriate expressions for Ksp when Ag2S, Fe(OH)3 and Mg3(PO4)2 dissolve in water.
Ksp = [Ag+]3[S2-]
Ksp = [Fe3+][OH-]3
Ksp = [Mg2+]3[PO43-]2
What is the approximate pH of a solution labeled 6 x 10-5 M HBr?
4.2
4.5
5.8
9.8
Which of the following solutions has the highest pH at 25oC? (No calculations required.)
Ammonium ion, Ka = 5.8 x 10-10
Hydrogen sulfate ion, Ka = 1.0 x 10-2
Hydrogen carbonate ion, Ka = 4.7 x 10-11
Hydrogen phosphate ion, Ka = 4.2 x 10-13
A 0.10 M solution of a weak acid, HX, is 0.059% ionized. Calculate Ka for the acid.
3.8 x 10-9
4.2 x 10-6
3.5 x 10-8
6.5 x 10-7
End point is the point at which the (a) change its color.
_________ indicates the equivalent quantities of reactants that have been mixed in a titration according to stoichimetric equation.
end point
equivalence point
indicator point
starting point
