(KSU) CHEM 1212 – Kennesaw State University –
Final Exam Study Guide Solutions and Complete
Laboratory Exam Preparation Material
Introduction
This document contains comprehensive solutions and practice
questions for the CHEM 1212 final exam at Kennesaw State
University. It covers spectrophotometry, solutions and colligative
properties, qualitative analysis, calorimetry, titrations, gas laws,
chemical equilibrium, kinetics, redox chemistry, buffers, and
laboratory safety concepts. The material includes worked
calculations, conceptual questions, and experimental applications
aligned with CHEM 1212 laboratory experiments and final exam
topics. It serves as a complete review resource for laboratory
procedures, chemical principles, and quantitative problem-solving.
Exam Questions and Answers
A red sports drink contains Red 40 dye. A 4.5 mL aliquot of this
sports drink was diluted to 25.0 mL with deionized water in a
volumetric flask to form a dilute drink solution. The concentration
of Red 40 dye in the dilute solution was determined to be 13.9 ppm
from the calibration plot.
,What is the concentration of Red 40 dye (ppm) in the original
sports drink? --- correct precise answer ---77.22
Which statement about the spectrophotometric analysis of Red 40
dye is TRUE?
Select one:
a) If there is no Red 40 dye present in the solution, the absorbance
will be zero.
b) Absorbance = slope / concentration.
c) The calibration plot is a graph of Concentration of Red 40 dye (y-
axis) versus Absorbance (x-axis).
d) The intensity of the color of the solution is indirectly
proportional to the concentration of the Red 40 dye. --- correct
precise answer ---a) If there is no Red 40 dye present in the
solution, the absorbance will be zero.
Define the following examples.
a) A property of a solution that is dependent on the number of
solute molecules in solution.
b) The ratio of moles of solvent to total moles in solution
c) The partial pressure of gas phase solvent molecules over a
solution of pure solvent at a given temperature. --- correct precise
answer ---a) colligative property
b) mole fraction of solvent
c) P° or vp°
,What is the mole fraction (Χ) of CH3OH, methanol, in a solution of
8.75 mL of CH3OH and 3.77 g of C6H5COOH, benzoic acid ?
Density of methanol is 0.792 g/mL
Molar mass of CH3OH is 32.04 g/mol
Molar mass of C6H5COOH is 122.12 g/mol
Select one:
0.750
0.900
0.875
0.850
0.800 --- correct precise answer ---0.875
What is the vapor pressure (in kPa) of CH3OH, methanol, over a
solution which is composed of 7.50 mL of methanol and 3.23 g of
C6H5COOH, benzoic acid, at 25ºC ?
Pº methanol at 25ºC = 16.915 kPa
Density of methanol is 0.792 g/mL
Molar mass of benzoic acid is 122.12 g/mol
Select one:
16.79 kPa
15.20 kPa
13.78 kPa
14.80 kPa --- correct precise answer ---14.80 kPa
, Callie, Gay, & Steve were discussing the results of this experiment
in terms of general trends. Which statement below is TRUE ?
Select one:
a) As the mole fraction of solvent became smaller, the Psolvent was
raised as compared to P°solvent.
b) As the mole fraction of solvent became smaller, the Psolvent
remained relatively the same as P°solvent.
c) As the mole fraction of solvent became smaller, the Psolvent was
lowered as compared to Pºsolvent --- correct precise answer ---c) As
the mole fraction of solvent became smaller, the Psolvent was
lowered as compared to Pºsolvent
What is the vapor pressure (in kPa) of ethanol, CH3CH2OH, over a
solution which is composed of 27.50 mL of ethanol and 14.38 g of
benzoic acid, C6H5COOH, at 35ºC ?Enter your number with two
digits past the decimal.
Pºethanol at 35ºC = 13.693 kPa
Density of ethanol = 0.789 g/mL, Molar mass of ethanol = 46.07
g/mol
Molar mass of benzoic acid = 122.12 g/mol --- correct precise
answer ---10.95
Raoult's Law works for other units of pressure, such as atm, mmHg,
and torr. The only requirement is that both vapor pressures have
the same units.
Final Exam Study Guide Solutions and Complete
Laboratory Exam Preparation Material
Introduction
This document contains comprehensive solutions and practice
questions for the CHEM 1212 final exam at Kennesaw State
University. It covers spectrophotometry, solutions and colligative
properties, qualitative analysis, calorimetry, titrations, gas laws,
chemical equilibrium, kinetics, redox chemistry, buffers, and
laboratory safety concepts. The material includes worked
calculations, conceptual questions, and experimental applications
aligned with CHEM 1212 laboratory experiments and final exam
topics. It serves as a complete review resource for laboratory
procedures, chemical principles, and quantitative problem-solving.
Exam Questions and Answers
A red sports drink contains Red 40 dye. A 4.5 mL aliquot of this
sports drink was diluted to 25.0 mL with deionized water in a
volumetric flask to form a dilute drink solution. The concentration
of Red 40 dye in the dilute solution was determined to be 13.9 ppm
from the calibration plot.
,What is the concentration of Red 40 dye (ppm) in the original
sports drink? --- correct precise answer ---77.22
Which statement about the spectrophotometric analysis of Red 40
dye is TRUE?
Select one:
a) If there is no Red 40 dye present in the solution, the absorbance
will be zero.
b) Absorbance = slope / concentration.
c) The calibration plot is a graph of Concentration of Red 40 dye (y-
axis) versus Absorbance (x-axis).
d) The intensity of the color of the solution is indirectly
proportional to the concentration of the Red 40 dye. --- correct
precise answer ---a) If there is no Red 40 dye present in the
solution, the absorbance will be zero.
Define the following examples.
a) A property of a solution that is dependent on the number of
solute molecules in solution.
b) The ratio of moles of solvent to total moles in solution
c) The partial pressure of gas phase solvent molecules over a
solution of pure solvent at a given temperature. --- correct precise
answer ---a) colligative property
b) mole fraction of solvent
c) P° or vp°
,What is the mole fraction (Χ) of CH3OH, methanol, in a solution of
8.75 mL of CH3OH and 3.77 g of C6H5COOH, benzoic acid ?
Density of methanol is 0.792 g/mL
Molar mass of CH3OH is 32.04 g/mol
Molar mass of C6H5COOH is 122.12 g/mol
Select one:
0.750
0.900
0.875
0.850
0.800 --- correct precise answer ---0.875
What is the vapor pressure (in kPa) of CH3OH, methanol, over a
solution which is composed of 7.50 mL of methanol and 3.23 g of
C6H5COOH, benzoic acid, at 25ºC ?
Pº methanol at 25ºC = 16.915 kPa
Density of methanol is 0.792 g/mL
Molar mass of benzoic acid is 122.12 g/mol
Select one:
16.79 kPa
15.20 kPa
13.78 kPa
14.80 kPa --- correct precise answer ---14.80 kPa
, Callie, Gay, & Steve were discussing the results of this experiment
in terms of general trends. Which statement below is TRUE ?
Select one:
a) As the mole fraction of solvent became smaller, the Psolvent was
raised as compared to P°solvent.
b) As the mole fraction of solvent became smaller, the Psolvent
remained relatively the same as P°solvent.
c) As the mole fraction of solvent became smaller, the Psolvent was
lowered as compared to Pºsolvent --- correct precise answer ---c) As
the mole fraction of solvent became smaller, the Psolvent was
lowered as compared to Pºsolvent
What is the vapor pressure (in kPa) of ethanol, CH3CH2OH, over a
solution which is composed of 27.50 mL of ethanol and 14.38 g of
benzoic acid, C6H5COOH, at 35ºC ?Enter your number with two
digits past the decimal.
Pºethanol at 35ºC = 13.693 kPa
Density of ethanol = 0.789 g/mL, Molar mass of ethanol = 46.07
g/mol
Molar mass of benzoic acid = 122.12 g/mol --- correct precise
answer ---10.95
Raoult's Law works for other units of pressure, such as atm, mmHg,
and torr. The only requirement is that both vapor pressures have
the same units.
