Determination of an Equilibrium Constant, please help me answer all of them Why

Question

Determination of an Equilibrium Constant, please help me answer all of them

Why is a calibration curve constructed? The slope of a Beers Law plot at 445 nm for the absorbing species [FeSCN^2+] is 4100 M^-1. If one of the equilibrium mixtures has an absorbance due only to [FeSCN^2] of 0.310 what is the concentration of [FeSCN^2+] in this mixture? Calculate the concentration of Fe^3+ in solution, if 5.00 mL of 0.20M Fe(NO_3)_3 was dispensed into a 50.0 mL volumetric flask and diluted with DI to the 50 mL mark. Write the equilibrium constant expressions for the following reactions: CH_3CO_2H (aq) + H_2O(l) H_3O^+(aq) + CH_3CO_2^-(aq) CaCO_3(s) Ca^2+(aq) + CO_3^-2(aq) If the K_eq value for (a) above was 14 would you expect there to be more reactants or products? Determine the pressure-based K_eq for the reaction: 2SO_2(g) + O_2(g) 2SO_3(g) given that 1.00 times 10^-2 moles of SO_2 and 2.00 times 10^-2 moles of O_2 were initially placed in a 2.00 L reaction chamber. The chamber contained 7.5 times l0^-3 moles of SO_3 when equilibrium was established at 727 degree C. Since you need to calculate the pressure-based equilibrium constant, you will need to use the ideal gas equation (PV = nRT) to convert the moles of gas into pressure with units of atmospheres, (remember that one formulation of R is 0.0821 L middot atm/mol middot K)

Explanation / Answer

1) The purpose of creating the calibrationcurve is to correct future measurements made with the sameinstrument to the correct units of measurement. The calibrationcurve can be applied many, many times before it is discarded orreworked as long as the instrument remains in statistical control. Chemical measurements arean exception where frequently the calibration curve is used onlyfor a single batch of measurements, and a new calibration curve iscreated for the next batch.

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