Redox Reaction Lab Report

98.) Consider the unbalanced redox reaction:
Cr2O72- (aq ) + Cu(s ) → Cr3+ (aq ) + Cu2+
Balance the equation in acidic solution and determine how much of a 0.850 M K2Cr2O7 solution is required to completely dissolve 5.25 g of Cu.
Nitric acid is usually purchased in concentrated form with a 70.3% HNO3 concentration by mass and a density of 1.41 g/mL. How much of the concentrated stock solution in milliliters should you use to make 2.5 L of 0.500 M HNO3?
Mass %= Mass Solute/ Mass Solvent + Mass Solvent x 100
Determine whether or not each reaction is a redox reaction. For those reactions that are redox reactions, identify the substance being oxidized and the substance being reduced.
(a) Zn(s) + CoCl2 (aq) → ZnCl2 (aq) + Co(s)
Oxidation number is Zinc when it is in its solid form of Zn(s) is 0. (Number of Zinc in

ZnCl2 is +2)
(b) HI(aq) + NaOH(aq) → H2O(l) + NaI(aq)
Oxidation number of iodine in HI and NaI is -1
(c) AgNO3 (aq) + NaCl(aq) →AgCl(s) + NaNO3 (aq)
Oxidation number of silver in AgNO3 and AgCl is +1
(d) 2 K(s) + Br2 (l) → 2 KBr(s)
Oxidation number of potassium in it solid form of K is 0 and oxidation number of potassium in KBr is +1
76.) Coal can be used to generate hydrogen gas (a potential fuel) by this endothermic reaction.
C(s) + H2O (g) ⇋ CO (g) + H (g)
If this reaction mixture is at equilibrium, predict the effect (shift right, shift left, or no effect) of
(a) Adding more C to the reaction mixture. Shift right
(b) Adding more H2O (g) to the reaction mixture. Shift right
(c) Raising the temperature of the reaction mixture. Shift left
(d) Increasing the volume of the reaction mixture. Shift left
(e) Adding a catalyst to the reaction mixture. No shift