CHEM 14BL Lab 3: Determination of the
Concentration and pKA of a Weak Acid Post-Lab
| 2025 Latest Update with complete solutions –
UCLA.
colligative property - answer-A property of a solution that depends on the
number, not the identity, of the solute particles.
Suppose that you add 27.8 g of an unknown molecular compound to 0.250 kg
of benzene, which has a
KfKf
of 5.12oC/m. With the added solute, you find that there is a freezing point
depression of 2.85oC compared to pure benzene.
What mass, in grams, of NaCl needs to be added to 2.3 kg of water in order to
create a solution with a freezing point of - -6.1 °C? The freezing point
depression constant of water is 1.86 ºC/m. - answer-220.3 g
, Suppose you are working with a NaOH stock solution but you need a solution
with a lower concentration for your experiment. Calculate the volume (in
milliliters) of the 1.345 M stock NaOH solution needed to prepare 250.0 mL of
0.1151 M dilute NaOH solution. - answer-21.39 mL
M1V1=M2V2
What is the correct reading of the temperature in the pictured thermometer?
*Example* - answer-44.4 C
The reaction rate is constant regardless of the amount of reactant in solution -
answer-Zero order
The reaction rate increases in direct proportion to the concentration of the
reactant in solution - answer-First order
An increase in the concentration of the reactant in solution causes the reaction
rate to increase exponentially - answer-Second order
In the Kinetics of an Iodine Clock Reaction procedure, the initial rate is
calculated by multiplying the initial concentration of
_______ by half, and dividing by the elapsed time as measured with a
______ - answer-thiosulfate ion
a stopwatch
Concentration and pKA of a Weak Acid Post-Lab
| 2025 Latest Update with complete solutions –
UCLA.
colligative property - answer-A property of a solution that depends on the
number, not the identity, of the solute particles.
Suppose that you add 27.8 g of an unknown molecular compound to 0.250 kg
of benzene, which has a
KfKf
of 5.12oC/m. With the added solute, you find that there is a freezing point
depression of 2.85oC compared to pure benzene.
What mass, in grams, of NaCl needs to be added to 2.3 kg of water in order to
create a solution with a freezing point of - -6.1 °C? The freezing point
depression constant of water is 1.86 ºC/m. - answer-220.3 g
, Suppose you are working with a NaOH stock solution but you need a solution
with a lower concentration for your experiment. Calculate the volume (in
milliliters) of the 1.345 M stock NaOH solution needed to prepare 250.0 mL of
0.1151 M dilute NaOH solution. - answer-21.39 mL
M1V1=M2V2
What is the correct reading of the temperature in the pictured thermometer?
*Example* - answer-44.4 C
The reaction rate is constant regardless of the amount of reactant in solution -
answer-Zero order
The reaction rate increases in direct proportion to the concentration of the
reactant in solution - answer-First order
An increase in the concentration of the reactant in solution causes the reaction
rate to increase exponentially - answer-Second order
In the Kinetics of an Iodine Clock Reaction procedure, the initial rate is
calculated by multiplying the initial concentration of
_______ by half, and dividing by the elapsed time as measured with a
______ - answer-thiosulfate ion
a stopwatch
