Ionic EquilibriumHard
Question
Auto-ionisation of liquid NH3 is
2NH3 ⇋NH4+ + NH2-
with KNH3 = [NH4+] [NH2-] = 10-30 at -50oC
Number of amide ions (NH2-), present per mm3 of pure liquid NH3 is
2NH3 ⇋NH4+ + NH2-
with KNH3 = [NH4+] [NH2-] = 10-30 at -50oC
Number of amide ions (NH2-), present per mm3 of pure liquid NH3 is
Options
A.602
B.301
C.200
D.100
Solution
2NH3 ⇋ NH4+ + NH2-
[NH4+] = [NH2-] =
= 10-15 M
1 dm3 of solution contains 10-15 moles = 6.02 × 1023 × 10-15 molecules of NH2-.
1 mm3 of solution contains 6.02 × 1023 × 10-15 × 10-6 = 602 NH2- ions.
[NH4+] = [NH2-] =
= 10-15 M1 dm3 of solution contains 10-15 moles = 6.02 × 1023 × 10-15 molecules of NH2-.
1 mm3 of solution contains 6.02 × 1023 × 10-15 × 10-6 = 602 NH2- ions.
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