5 45, Balance each of the following oxidation-reduction
reactions, which take place in acidic solution, by us-
ing the "half-reaction" method.
a. Mg(s) + Hg2+ (aq) → Mg2+ (aq) + Hg22+(aq)
b. NO3- (aq) + Br (aq) → NO(g) + Brz(1)
c. Ni(s) + NO3- (aq) → Ni2+ (aq) + NO2(8)
d. C104 (aq) + Cl(aq) → ClO3- (aq) + Cl2(8)

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.