Consider the reaction of dimethylammonium ion ((CH 3 ) 2 NH 2+ ) with water: (%u

Question

Consider the reaction of dimethylammonium ion ((CH3)2NH2+) with water:

(%u2212) means ( - ) sign ( negative )

1. Select the correct chemical equation:

(CH3)2NH2+ (aq) + H2O (l) %u21CC (CH3)2NH (aq) + OH%u2212 (aq)

(CH3)2NH2+ (aq) + H2O (l) %u21CC (CH3)2NH (aq) + H3O+ (aq)

(CH3)2NH2+ (aq) + H2O (l) %u21CC (CH3)2NH32+ (aq) + H3O+ (aq)

(CH3)2NH2+ (aq) + H2O (l) %u21CC (CH3)2NH32+ (aq) + OH%u2212 (aq)

2. The equilibrium expression for this reaction corresponds to:

Ka

Kb

3. The numerator of the equilibrium expression (from 2) for this reaction (dilute solution) is:

[ OH%u2212 ][ (CH3)2NH2+ ]

[ H3O+ ]

[ (CH3)2NH ][ H3O+ ]

[ (CH3)2NH32+ ][ H3O+ ]

[ (CH3)2NH ]

[ (CH3)2NH32+ ][ OH%u2212 ]

[ (CH3)2NH32+ ]

[ (CH3)2NH2+ ][ H3O+ ]

4. The denominator of the equilibrium expression (from 2) for this reaction (dilute solution) is:

[ (CH3)2NH ]

[ OH%u2212 ]

[ (CH3)2NH2+ ][ H2O ]

[ (CH3)2NH ][ OH%u2212 ]

[ (CH3)2NH2+ ]

[ (CH3)2NH2+ ][ OH%u2212 ]

[ (CH3)2NH32+ ]

[ (CH3)2NH ][ H3O+ ]

Explanation / Answer

1) option 2

2) option 1

3) option 3

4) option 5

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