Select one (1) of the examples which can function as a: [you may use an answer m

Question

Select one (1) of the examples which can function as a: [you may use an answer more than once]

a.        Lewis acid                               _______                                 (1)       NH4+  

b.        Lewis base                              _______                                 (2)       BF3

c.        Bronsted-Lowery acid             _______                                 (3)       NH3

d.        Bronsted-Lowery base              _______

C) Write the formula of a salt which can be added to each of the following 0.1M solutions in

order to make a buffer solution. HC2H3O2 ___________   NH3 ______________

Explanation / Answer

Lewis acid - BF3 as the central atom, B can accept electrons as it is electron deficient.

Lewis base - NH3 can donate electrons as the central N has lone pair of electrons which can be donated.

Bronsted-Lowery acid - NH4+ It can donate H+ ion

Bronsted-Lowery Base - NH3 can accept H+ ion

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Buffer solution is a mixture of weak acid + conjugate base or a weak base + conjugate acid

HC2H3O2 is a weak acid and it would make a buffer with it's conjugate base C2H3O2-

NH3 is a weak base and it would make a buffer with it's conjugat acid NH4+

HC2H3O2 _+_C2H3O2Na_________  

NH3 ____+__NH4Cl________

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