What was your average value for K_eq What it \"big\" or \"small?\" What does thi

Question

What was your average value for K_eq What it "big" or "small?" What does this tell you about the reaction? was your value for K_eq constant? If not, why not? Explain how different experimental errors can affect the reported value of K_eq. Clearly state why the reported value of K_eq would be bigger or smaller than the actual value. Examples may include: You thought the spectrometer was set to read transmittance/absorbance at a wave- length of 447 nm, actually set at 520 nm. b, You thought you measured the transmittance absorbance in a cuvetter with a 1-cm pathlength, but it was actually 1.5 cm. Would your K_eq results have been affected if you had chosen to use 5.00 mL of KSCN and altered the volume of Fe(NO_3)_5 solution used? (Explain clearly.)

Explanation / Answer

1. average value of Keq is big, which tells us the formation of products is favoured under the given reaction conditions.

2. The value of Keq varied slightly but remained almost constant throughout.

3. Experimental errors

a. If the maximum wavelength was set at 420 nm instead of needed 447, low absorbance values would be obtained, which would give lower values for complex formed and thus Keq would also be found lower than expected.

b. If the cuvetter used was of 1.5 cm instead of 1.0 cm. more light would be absorbed, absorbance would be higher, Keq would thus be higher than expected value.

4. Yes, the concentration of Fe3+ hen varied would also change amount of complex generated in the reaction and thus it would change the value of Keq found accordingly.

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