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(Answered) CALCULATIONS Calculations should be performed on the data you collected and the data that the other pair collected. (Therefore, each trial and the...


CALCULATIONS Calculations should be performed on the data you collected and the data that the other pair collected. (Therefore, each trial and the...


Hi Im really lost on my post lab assignment i think I've done calculations 1 correctly but I'm unsure with problem 2-6.CALCULATIONS

 

Calculations should be performed on the data you collected and the data that the other

 

pair collected. (Therefore, each trial and the standard have two sets of data.) It should

 

be clear to the TA which data is yours.

 

 

 

1.

 

For all trials (including those trials from the other pair of students), calculate the

 

initial concentrations of the reactants, [Fe

 

3+

 

]

 

i

 

and [SCN

 

–

 

]

 

i

 

. (Note: The initial

 

concentrations must be calculated from the concentrations found in the procedure. A

 

dilution occurs when Fe

 

3+

 

(aq), SCN

 

-

 

(aq), and H

 

2

 

O(l) are combined.) Show one sample

 

calculation for each reactant.

 

2.

 

Show the derivation of equation (2).

 

3.

 

Show the derivation of equations (3) and (4) by creating an ICE chart (Initial

 

Change Equilibrium).

 

4.

 

Calculate [FeNCS

 

2+

 

]

 

std

 

.

 

5.

 

For all trials (yours and the other pair’s), calculate the equilibrium concentrations

 

of the reactants and products, [Fe

 

3+

 

]

 

eq

 

, [SCN

 

–

 

]

 

eq

 

, and [FeNCS

 

2+

 

]

 

eq

 

. Show one sample

 

calculation for each reactant and the product.

 

6.

 

For all trials (yours and the other pair’s), calculate Kc. Provide the Kc expression

 

and one sample calculation.

 

ERROR ANALYSIS

 

1.

 

Perform a Q-test on either the lowest or highest K value (choose the one most

 

likely to be an outlier). If the data point fails the test, throw it out. Then, determine an

 

average value for K

 

c

 

and the estimated standard deviation.

 

2.

 

What modifications could be made to the procedure to better account for random

 

(indeterminate) errors?

 

3.

 

List three potential systematic (instrumental, methodological, or personal) errors

 

that could be made in this experiment. (Note: Be specific, systematic errors are in

 

the details. For example, losing your solution because you knocked over the cuvette

 

is not a systematic error – it’s a gross one.)

 

4.

 

a. Why did you blank with the 0.0020 M Fe(NO

 

3

 

)

 

3

 

solution as opposed to just DI

 

water?

 

What does it do to your spectrum?

 

b. What chemicals create the absorbance you observe from the standard solution (Test

 

Tube

 

#4)?

 

c. How can you find the absorption of only the FeNCS

 

2+

 

in the standard solution?

 

5.

 

Did any gross errors occur? Did you mess up? Did the equipment or

 

instrumentation fail?

 


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DATE ANSWERED

Jan 02, 2020

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