Question

2. Complete the table given that the following three reactions occur in the direction as written: a) 2Ag' (aq) + Fe(s) - Fe?' (aq) + 2Ag (s) b) 2Ag (aq) + Cu(s) — Cu (aq) + 2Ag (s) c) Cu (aq) + Fe (s) - Fet (aq) + Cu(s) Reaction Species oxidized Species reduced Oxidizing agent Reducing agent 3. Based on the three reactions, rank the oxidizing and reducing agents in order of strength. Strength Oxidizing agent Reducing agent Strongest Intermediate weakest 4. Consider the following unbalanced oxidation-reduction reaction. Identify the oxidizing and reducing agents for the reaction. Cr" (aq) + H2O(l+ ClO3(aq) + Cr2O72- (aq) + CO2(g) + H+ (aq) oxidizing agent reducing agent CHEM1515-YEAR 2019-2020 10-2

Please help. I'm not sure how to go about figuring out which species oxidize or reduce or which are the agents.

Answer 1

-2. onidation: When a species increases ets onication number, then it is said to undergo oxidation. It happens due to loss of election (3) Reduction: When a species decreases its ouidation number then et undergoes reduction. It happens cohen et gains election (s). (a) 2Ag cag) + Fe (3) ► fear + 2 Ag (3) here, onication state of Pe increases from o in se to +2 in fe. This means fe undergoes onidation. At the same time, onication state of Ag Changes from +1 in Agt to o in Ag. So, Ag undergoes reduction. onidizing agent : the species that undergoes reduction is called onedizing agent as et onidizes other and itself gets reduced. Reducing agent: The species that cendergoes onidation is called reducing agent as et reduces other and itself gets onidized. Thus, species onidized = Fe(s)] species reduced = Agrars] Oriedizing agent - Agrey Reducing agent = [Fe(s)]

(6) 2 Ag+ (aq) + Cu(s) > Cat g) + 2Ag (5) Onication state of Ag changes from t in Agt to o en Ag. So, Agt is reduced. Onedizing agent of Cu increases from o in Cu to +2 en Cart So Cu as oxidized. Thus, species onidized Cu(s) especies reduced = Agt Cage 1 oridizung agent = | Ag @qy! Reducing agent = [Cu (6)] © Curteag) + fe(8) - fez tag) + Cu (3) Onidation of Cu decreases from t2 in Cu2+ to o ein Cr. So, cast is reduced. Onication state of fe encreases from o in Pe to +2 in Pe 2+ So, fe is onedized. Thus, species onidized = [Fe(s) species reduced = curtcess) onidizing agent - Cutters] reducing agent = [Fe(s) / Canned with Scanner

3. In the three reactions given in 2, Agt onidizes both fe and Cu. So Agt is the strongest onidizing agent. Cu 2+ onidizes only se while re doesn't onidizes any species. Thus, strongest onidizing agent - Agilag Putermediate oridizing agent - Counter) weakest onedizing agent = Fe (s)] in terms of reducing agent, the enact opposite trend follows. In the reactions, te reduces both Art and and Cult, Cu reduces Agt and Agt doesn't reduced anything. Thus, strongest reducing agent = [Fe (s)] intermediate reducing agent - Cu (s)] weakest reducing agent - Agter ! Scanned with CamScanner

4. Çotaq? + HD (1) + C103@q) Gazem?caq) + Co,cg) Onidation state of G encreases & H cap from +3 to +6. Thes, G3+ onidizes to Go7 Similarly, when going from 903 to cloa, onidation State of at reduces from ts in clož to thin ClO₂ so coz is reduced to CO2. Thus, onidizing agent (that undergoes reduction) = 10 ago seducing agent (Hat enolegoes oxidation) - Go *aqe CS Scanned with CamScanner