CHEM 212 LAB REPORT 3 2023/2024| PORTAGE
LEARNING|WITH PROCEDURES, EXPLANATION
AND FINAL RESULTS.HIGHLY VERIFIED
Experiment #: Lab 3 Title: Enzymatic Activity of
Lactase
At the equivalence point of titration if a strong base and weak acid which off the
following statements is true?
A. the volume of base is equal to the volume of acid
B. The moles of base is equal to the moles of acid
C. The pH is a neutral 7.00
D. All titration indicators will change to a dark pink color - ANSWER B. The moles of
base is equal to he moles of acid
What does the letter "p" stand for in pH, pKa, and pKb? - ANSWER "p" means the
negative log of whatever it is attached to.
What are the units for activation energy (Ea)? - ANSWER J/mol
Equation used when calculating Ea from a graph - ANSWER Ea=(-slope)(R)
Today, in order to determine Activation Energy for the reaction we will change the
temperature of the reaction and measure the rate. Changing the temperature will
affect which aspect of the Rate Law?
A. Concentration of [I03-]
B. Concentration of [H2SO3]
C. k
D. Reaction Orders - ANSWER C. k
The equation of the line that we will use today is ln k= [-Ea/R(1/T)]+ln A - ANSWER
slope= -Ea/R
Which graph plots a line with a slope for reaction order when the rate is measured at
various I- concentrations - ANSWER Y= log(rate)
X= log[I-]
Equation that relates the concentrations and volumes on two separate occasions -
ANSWER V1C1=V2C2
Equation for Kf - ANSWER Kf= Change in Tf/m
molality - ANSWER mol solute/kg solvent
molarity - ANSWER mol solute/L solution
LEARNING|WITH PROCEDURES, EXPLANATION
AND FINAL RESULTS.HIGHLY VERIFIED
Experiment #: Lab 3 Title: Enzymatic Activity of
Lactase
At the equivalence point of titration if a strong base and weak acid which off the
following statements is true?
A. the volume of base is equal to the volume of acid
B. The moles of base is equal to the moles of acid
C. The pH is a neutral 7.00
D. All titration indicators will change to a dark pink color - ANSWER B. The moles of
base is equal to he moles of acid
What does the letter "p" stand for in pH, pKa, and pKb? - ANSWER "p" means the
negative log of whatever it is attached to.
What are the units for activation energy (Ea)? - ANSWER J/mol
Equation used when calculating Ea from a graph - ANSWER Ea=(-slope)(R)
Today, in order to determine Activation Energy for the reaction we will change the
temperature of the reaction and measure the rate. Changing the temperature will
affect which aspect of the Rate Law?
A. Concentration of [I03-]
B. Concentration of [H2SO3]
C. k
D. Reaction Orders - ANSWER C. k
The equation of the line that we will use today is ln k= [-Ea/R(1/T)]+ln A - ANSWER
slope= -Ea/R
Which graph plots a line with a slope for reaction order when the rate is measured at
various I- concentrations - ANSWER Y= log(rate)
X= log[I-]
Equation that relates the concentrations and volumes on two separate occasions -
ANSWER V1C1=V2C2
Equation for Kf - ANSWER Kf= Change in Tf/m
molality - ANSWER mol solute/kg solvent
molarity - ANSWER mol solute/L solution
