
(a)
Interpretation:
Whether the two given methods agree with each other at the
Concept Introduction:
Comparing replicate measurements:
When the two standard deviations are not significantly different from each other, the equation used is:
To Give: Whether the two given methods agree with each other at the
(a)

Answer to Problem 4.23P
The difference between the two methods of rain water is not significant.
The difference between the two methods of drinking water is not significant.
Explanation of Solution
Given data:
The results for the measurement of nitrite
Figure 1
Rainwater:
Let us assume,
The mean
The mean
The number of measurement of spectrophotometry method is
The number of measurement of spectrophotometry methods is
F-Test:
First, calculate F-Test and find whether the standard deviations of the given methods are significant or not.
For
Hence, the standard deviations of two sets of measurements are not significantly different.
Therefore, the equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
Drinking water:
Let us assume,
The mean
The mean
The number of measurement of spectrophotometry method is
The number of measurement of spectrophotometry methods is
F-Test:
First, calculate F-Test and find whether the standard deviations of the given methods are significant or not.
For
Hence, the standard deviations of two sets of measurements are not significantly different.
Therefore, the equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
The difference between the two methods of rain water is found out to be not significant.
The difference between the two methods of drinking water is found out to be not significant.
(b)
Interpretation:
Whether the drinking water contain more nitrite than the rain water at the
Concept Introduction:
Comparing replicate measurements:
When the two standard deviations are not significantly different from each other, the equation used is:
To Give: Whether the drinking water contain more nitrite than the rain water at the
(b)

Answer to Problem 4.23P
At the
Explanation of Solution
Given data:
The results for the measurement of nitrite
Figure 1
Gas chromatography:
The equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
Spectrophotometry:
The equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
At the
Want to see more full solutions like this?
Chapter 4 Solutions
Quantitative Chemical Analysis
- true or false The equilibrium constant for this reaction is 0.20. N2O4(g) ⇔ 2NO2(g) Based on the above, the equilibrium constant for the following reaction is 0.4. 2N2O4(g) ⇔ 4NO2(g)arrow_forwardtrue or false Using the following equilibrium, if heat is added the equilibrium will shift toward the reactants. N2(g) + 3H2(g) ⇔ 2NH3(g) + heatarrow_forwardTrue or False Using the following equilibrium, if heat is added the equilibrium will shift toward the products. N2O4(g) + heat ⇔ 2NO2(g)arrow_forward
- true or false Using the following equilibrium, if solid carbon is added the equilibrium will shift toward the products. C(s) + CO2(g) ⇔ 2CO(g)arrow_forwardProvide the complete mechanism for the reaction below. You must include appropriate arrows,intermediates, and formal charges. Please also provide a reason to explain why the 1,4-adduct is preferred over the 1,3-adduct.arrow_forwardWhich of the following pairs are resonance structures of one another? I. III. || III IV + II. :0: n P !༠ IV. EN: Narrow_forward
- Predict the major organic product(s) and byproducts (either organic or inorganic) for thefollowing reactions.arrow_forwardA 8.25 g sample of aluminum at 55°C released 2500 J of heat. The specific heat of aluminum is 0.900 J/g°C. The density of aluminum is 2.70 g/mL. Calculate the final temperature of the aluminum sample in °C.arrow_forwardPredict the major organic product(s) and byproducts (either organic or inorganic) for thefollowing reactions.arrow_forward
- Predict the major organic product(s) and byproducts (either organic or inorganic) for thefollowing reaction.arrow_forwardplease helparrow_forwardExperiment 1 Data Table 1: Conservation of Mass - Initial Mass Data Table 1 Data Table 2 Data Table 3 Data Table 4 Panel 1 Photo 1 Data Table 5 Reaction Mass of test tube and 5.0% HC₂H₂O2 (g) # (A) (B) Mass of NaHCO, (g) Mass of balloon and NaHCO, (g) (C) 0.10 1 0829 14.38g 0.20 2 0.929 14.29g 0.35 1.00g 3 14.25g 0.50 1.14g 14.29 Experiment 1 Data Table 2: Moles of HC2H3O2 Reaction Volume of Mass of Moles of HC₂H₂O₂ 5.0% Vinegar (g) (ML) 5.0 0.25 0042 mol 2 5.0 0.25 0042 mol 3 5.0 0.25 0042 mol 5.0 0.25 0042 mol Experiment 1 Data Table 3: Moles of NaHCO3 Reaction Mass of NaHCO (g) 10g 20g 35g 50g Experiment 1 Data Table 4: Theoretical Yield of CO₂ Reaction # 1 2 3 Experiment 1 Total mass before reaction (g) (D=A+C) 15.29 15.21g 15.25g 15.349 Exercise 1 Data Table 1 Data Table 2 Data Table 3 Data Table 4 Panel 1 Photo 1 Data Table 5 Exercise 1- Data Table 1 Data Table 2 DataTable 3 Data Table 4 Panel 1 Photo 1 Data Table 5 Exercise 1- Moles of NaHCO 0012 mol 0025 mol 0044 mol 0062 mol…arrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY





