CHM211H5 Lecture Notes - Lecture 2: 5,6,7,8, Approximation Error, Observational Error

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carminecheetah93

7 Sep 2017

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Mean: sum of data divided by the total number of data. Take more measurements, n should not equal 1. Median: arrange data in acs or desc order, median is the middle number. Mean and median help us establish the presence of an outlier. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 (even n) The outlier may occur because of error, human or mechanical. You will be marked based on precision and accuracy in your lab results. Accuracy: how close the value of your data is to the true value of the data. Doesn"t change average, spreads the data evenly on all sides and axis. Gross error: makes for outliers, falls under systematic error. Method error: dealing with something that maybe reacting with things you didn"t account for; slow reactions, instability of reactant and products. Constant error: error independent of size of sample being analyzed; greater consequence as the sample size decreases.

Related Questions

complete the table
using the given values

Table #1: Volumes

Trial	Deionized Water (mL)	1.0 M KI (mL)	H₂O₂ (mL)	Temperature of Tap Water (â¦C)
1	100	50	50	18.7
2	125	25	50	19.3
3	125	50	50	19.5
4	100	50	50	50.0

Table #2: Trial #1 data

Time (min)	Volume (mL)	Time (min)	Volume (mL)
3	0	8	12
4	1	9	15
5	4	10	18
6	6	11	25
7	8	12	27

Table #3: Trial #2 data

Time (min)	Volume (mL)	Time (min)	Volume (mL)
6.27	0	11.27	6
7.27	1	12.27	7
8.27	3	13.27	9
9.27	4	14.27	11
10.27	6	15.27	12

Table #4: Trial #3 data

Time (min)	Volume (mL)	Time (min)	Volume (mL)
5.37	0	9.37	5
6.37	2	10.37	6
7.37	3	11.37	8
8.37	4	12.37	9

Table #5: Trial #4 data

Time (min)	Volume (mL)	Time (min)	Volume (mL)
1.30	0	6.30	62
2.30	5	7.30	82
3.30	13	8.30	100
4.30	26	9.30	115
5.30	41	10.30	132

Table #6: Results

Trial	Temperature (K)	3% H₂O₂ (M)	KI (M)	Rate (L/min)
1	291.85	0.176	0.005	0.00225
2	292.45	0.176	0.0025	0.00075
3	292.65	0.176	0.005	0.0009
4	323.15	0.176	0.005	0.0132

Above are 6 tables of data from an experiment I performed. My goal is to determine the reaction order with respect to H2O2 and I- , the rate law for the reaction, and the activation energy for the reaction. My first issue is table #6. I do not believe that I have figured the correct (M) for the H2O2 and KI or the correct rate. I am supposed to make sure to express the concentrations based on the values after dilution due to mixing. I am not sure how to correctly calculate that.

PreLab Experiment #3: Cyclic Voltammetry

Please complete these set of questions before coming to the lab to perform Experiment #3.

Name:__________________________________ Date:_______________ Score:__________

(2pts) What is cyclic voltammetry.

(2pt) Which of the following is a stronger electrolyte KCl or KNO₃?

(10 pts) Provide the weight of volume missing in the Table below in preparation for the experiment

#	Reagent	Volume	Molarity	Weight or Volume	Solvent
1	K₃Fe(CN)₆	100 mL	50mM		1mM KNO₃
2	KNO₃	500 mL	0.1 M		H₂O
3	KCl	500 mL	0.1 M		H₂O
4	K₃Fe(CN)₆	50 mL	2 mM		0.1 M KNO₃
5	K₃Fe(CN)₆	50 mL	4 mM		0.1 M KNO₃
6	K₃Fe(CN)₆	50 mL	6 mM		0.1 M KNO₃
7	K₃Fe(CN)₆	50 mL	8 mM		0.1 M KNO₃
8	K₃Fe(CN)₆	50 mL	10 mM		0.1 M KNO₃
9	K₃Fe(CN)₆	50 mL	2 mM		0.1 M KCl
10	K₃Fe(CN)₆	50 mL	4 mM		0.1 M KCl
11	K₃Fe(CN)₆	50 mL	6 mM		0.1 M KCl
12	K₃Fe(CN)₆	50 mL	8 mM		0.1 M KCl
13	K₃Fe(CN)₆	50 mL	10 mM		0.1 M KCl

(6 pts) List the specific data you need to record on your lab notebook for Experiment#3.

You can create a table and/or sample graph indicating what data you need to fill in.

CHM211H5 Lecture Notes - Lecture 2: 5,6,7,8, Approximation Error, Observational Error

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