Ionic EquilibriumHard
Question
Which of the following mixtures will act as buffer ?
Options
A.H2CO3 + NaOH (1.5 : 1 molar ratio)
B.H2CO3 + NaOH (1.5 : 2 molar ratio)
C.NH4OH + HCl (5 : 4 molar ratio)
D.NH4OH + HCl (4 : 5 molar ratio)
Solution
(A) H2CO3 + OH- → HCO3- + H2O
moles 1.5 1
0.5 - 1
so it is a buffer solution.
(B) H2CO3 + OH- → HCO3- + H2O
moles1.5 2
- 0.5 1.5
HCO3- + OH- → CO32- + H2O
moles 1.5 0.5
- - 0.5
so it is a buffer solution.
(C) NH4OH + H+ → NH4+ + H2O
moles 5 4
1 - 4
so it is a buffer solution.
moles 1.5 1
0.5 - 1
so it is a buffer solution.
(B) H2CO3 + OH- → HCO3- + H2O
moles1.5 2
- 0.5 1.5
HCO3- + OH- → CO32- + H2O
moles 1.5 0.5
- - 0.5
so it is a buffer solution.
(C) NH4OH + H+ → NH4+ + H2O
moles 5 4
1 - 4
so it is a buffer solution.
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