Question Details
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 26.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.
Â
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
â€“
]
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 pairâ€™s), calculate the equilibrium concentrations
of the reactants and products, [Fe
3+
]
eq
, [SCN
â€“
]
eq
, and [FeNCS
2+
]
eq
. Show one sample
calculation for each reactant and the product.
6.
For all trials (yours and the other pairâ€™s), calculate Kc. Provide the Kc expression
and one sample calculation.
ERROR ANALYSIS
1.
Perform a Qtest 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 â€“ itâ€™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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