(XIV) (7 points) In the following reaction 2MnO, (ag) + H20(0) +3503(aq) = 2Mn0z(s) +350- (aq) + 20H - (aq) what is the

[answerhappygod]

Xiv 7 Points In The Following Reaction 2mno Ag H20 0 3503 Aq 2mn0z S 350 Aq 20h Aq What Is The 1 (46.33 KiB) Viewed 38 times

(XIV) (7 points) In the following reaction 2MnO, (ag) + H20(0) +3503(aq) = 2Mn0z(s) +350- (aq) + 20H - (aq) what is the change in oxidation number for S? O +3 0-3 +2 0-2 00 (XV) (7 points) Halfway to the equivalence point in a titration curve of a weak acid with a strong base, nothing is happening yet. the pH = pkn of the weak acid. pH = 3.5 exactly pH = pka of the indicator the pH has not yet changed. (XVI) (10 points) A solution of benzoic acid (0.21M, 25.00 mL), a monoprotic acid, was titrated with 53.10 mL of 0.10 M sodium hydroxide (Ka of benzoic acid = 6.46 x 10-5). What is the final pH of this solution? 3.11 1.17 7.00 12.83 10.89 (XVII) (10 points) Calculate the solubility of MgF, in water if the Ky, for the compound is 6.40 x 10-9 O 2.13 x 10-M 1.86 x 10- 1.17 x 10-M 1.47 x 10-3MO 3.25 x 10-M (XVIII) (10 points) Consider the standard reduction potentials in Table 2. Which reaction below will proceed spontaneously as written from left to right? Reduction Half-Reaction E (volts) Cr++ (aq) + 36" Cr(s) -0.74 Cd?+ (aq) + 2e → Cd(s) -0.40 Ni2+ (aq) + 2e → Ni(s) -0.23 Table 2: OOOOO 2Cr + (aq) + 3Cl(s) 2Cr(s) + 3C&+ (aq) 2Cr+ (aq) + 3Ni(s) + 2Cr(s) + 3Ni2+ (aq) Cd2+ (aq) + Ni(s) → Cd(s) + Ni2+ (aq) Cd(s) + Ni2+ (aq) → Cd2+ (aq) + Ni(s) None of these will proceed spontancously.