,1315 + lo H-13.5 400 M 1 lb) Write the neutralization reaction that occurs if N
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Question
,1315 + lo H-13.5 400 M 1 lb) Write the neutralization reaction that occurs if NaOH is added to the buffer solution above (3 pt) 12) Cobalt is a transition metal used in the fabrication of electrodes for rechargeable lithium-ion batteries Oxalate, C,07, is a ligand that reacts with cobalt to form the complex ion [Co(C20]". Kr 1.1 x 10 A battery engineer dissolves 0.600 moles of cobalt (III) nitrate in distilled water to create 2.00 liters of aqueous cobalt solution. The aqueous cobalt solution is then treated by adding 0.800 mole of sodium oxalate. What are the concentrations of Co (aq) and oxalate in the sample once the solution has reached equilibrium? (8 pts)Explanation / Answer
Molarity of Co(NO3)3 = number of moles/Volume of solution in L = 0.600/2 = 0.3M
Molarity of C2O4(2-) solution = number of moles/Volume of solution in L = 0.800/2 = 0.4M
The reaction will be
Co^(3+) + 3C2O4^(2-) --------- [Co(C2O4)3]3-
Initial 0.3 0.4 0
Final (0.3-x) (0.4-3x) x
K = [Products]/[Reactants] = x/[(0.3-x)(0.4-3x)^3] = 1.1 * 10^(20)
x = 0.133332
Concentration of Co(3+) = 0.3 - 0.133332 = 0.16668
Concentration of oxalic acid = 0.4 - 3(0.133332) = 4.0 * 10^(-6)
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