Question

1. Consider the unbalanced redox reaction taking place in an acidic aqueous solution VO,* (aq) + S0,- (aq) → VO" (aq) + S0,- (aq) The unbalanced oxidative half-reaction for this redox reaction is: VO,* (aq) → VO" (aq) (la) Because the reaction takes place in aqueous solution, the reaction can be balanced by adding water. a. Add water to reaction (la) to balance the oxygen. This will give reaction (1b). (1b) Because the reaction takes place in an acidic solution, the reaction can be balanced by adding H(aq). b. Add H(aq) to reaction (1b) to balance the hydrogen. This will give reaction (1c). Because this is a half-reaction, the reaction can be balanced by adding electrons. c. Adde to reaction (10) to balance the charge. This will give reaction (1d). The unbalanced reductive half-reaction for the redox reaction is: So,- (aq) +0,- (aq) a. Add water to reaction (2a) to balance the oxygen. This will give reaction (2b). b. Add H(aq) to reaction (2b) to balance the hydrogen. This will give reaction (2c). c. Adde to reaction (2c) to balance the charge. This will give reaction (2d). d. Combine reactions (1d) and (2d) to produce a "whole" reaction that is balanced and does not show electrons as a reactant or a product.

Answer 1

I Ans - The unbalanced sedox reaction talung place in an acidie aqueous solution is Voat(aq) + 502 - (aq) → vot(aq) + 60.2 card The unbalanced sidativo half reaction is Vogt (ag) → Vot (ag) - @ @ Adding water to balanu the oxygen .. Voat (aq) → vot (aq) + 2011 - ② @ Adding Ht (aq) to 6 to balance hydrogen vost (aq) + 2H+ -- Vo* (aq) +50(l) - © @ Adding é to reaction @ to balance charge. 10 t (as) + 2H+ + aé vot (aq) + 2011) - The unbalanced seductive half reaction is @ @ Adding water to 20 to balance sygen So 9.70g) + H010 → som locag) - Adding hydrogen in (ar) to reaction (21 to balance hydrogen 50,2- (aq) + 40(1) S022" (aq) + 2H" (az) - -

© Adding é to reaction a to balance chiarge so, a cap) + BOVE) S02 Cag) + 2H+ (aq) +2e el. @ Combining (d) and (ad to produce a whole reaction that is balanced and doesnot show! electrons as reaitant in a product is. vost (aq) + 2H+ +50,3-(aq) +BO(e) → vo"(aq) + 4301) +509 Tage)+2 W a) Cancelling 30 and 4t we get vot (aq) + $0 ² (aq) → vot(aq) + 50 2- (aq) This is a balanced equation is respect of the number of atoms and charge on both sides of