In which of the following acid-base titration, pH is greater than 8 at equivalence point?
Acetic acid versus ammonia
Acetic acid versus sodium hydroxide
Hydrochloric acid versus ammonia
Hydrochloric acid versus sodium hydroxide
When the temperature of reactions will increase then the effect on pH value will
increase
decrease
first increases then decreases
remains same.
Consider the following salts : NaCl, HgCl2, Hg2Cl2, CuCl2, CuCl and AgCl. Identify the correct set of insoluble salts in water.
Hg2Cl2, CuCl, AgCl
Hg2Cl, CuCl, AgCl
Hg2Cl2, CuCl2, AgCl
Hg2Cl2, CuCl, NaCl
The pH of aqueous solution ofammonium formate is (pKa of HCOOH = 3.8 and pKb of NH3= 4.8)
7
6.0
6.5
8.9
The pH value of decinormal solution of NH4OH which is 20% ionised is
12.95
12.30
14.70
13.30
B.
12.30
Concentration NH4OH solution = 0.1 N
Concentration of OH ions in solution,
For the reaction,
2SO2 (g) + O2 (g) 2SO3 (g) at 300 K, the value of G° is -690.9 R. The equilibrium constant value for the reaction at that temperature is (R is gas constant)
10 atm-1
10 atm
10
1