Question

Can someone please help me with number 3 ?

Please give step by step instructions on how u got the answer.

Thank You so much !!! :)

Answer 1

A buffer must contain: weak acid + conjugate base OR weak base + conjugate acid

so:

a) is true, since NH3 + NH4+ forms a buffer

b) not likely, since H2CO3 <-> HCO3- and CO3-2 is present

c)

this is correct, since

H2CO3 <-> HCO3-

and

NaHCO3 --> Na+ + HCO3-

this is acidic buffer

d)

tru, since

HPO4-2 and PO4-3 form acidic buffer of third ionization of H3PO4 acid

e

no, since HCl is strong acidd