Discussion Questions Here are some factors that may be sources of error: A. misr
ID: 544850 • Letter: D
Question
Discussion Questions Here are some factors that may be sources of error: A. misreading the burette x B. differences in the volume of water used to dissolve the oxalic acid C. overshooting the endpoint D. error in transferring all of the oxalic acid into the Erlenmeyer flask E. using different amounts of oxalic acid for each trial.> Of the above choices, which two do you think would cause the most significant error determining the concentration of NaOH? Explain your reasoning. a. Of the above choices, which two could not be sources of error in determining the concentration of NaOH? Explain your reasoning. b.Explanation / Answer
a. The two most significant errors for determining the concentration of NaOH would be
A. Misreading the burette.
The volume of the NaOH added to the solution recorded will affect the concentration of NaOH.
Concentration of NaOH is calculated by using formula Vbase x Cbase = Vacid x Cacid
Where Vbase is the volume of base consumed in the titration, Cbase is the concentration of the base, Vacid is the volume of the solution of acid added to the Erlenmeyer and Cacid is concentration of the acid (which is known)
If we misread volume of the NaOH less, then the concentration of NaOH would high and vice versa.
Cbase = Vacid x Cacid/ Vbase
C. Overshooting the endpoint
Vbase x Cbase = Vacid x Cacid
The volume of the NaOH added to the solution recorded will affect the concentration of NaOH.
Overshooting the endpoint means more volume of NaOH is added. Vacid and Cacid are known. If Vbase is more, then the concentration of NaOH would low.
b. The two is not a source of errors for determining the concentration of NaOH
B. Difference in volume of water added to dissolve the oxalic acid
E. Using different amount of oxalic acid for each trial
Explanation Cacid is concentration of the acid, which is known. If we add different volume of water to dissolve the oxalic acid, the concentration of the acid would be different, but Vacid x Cacid is constant for Vbase x Cbase. So, there will be no effect on the concentration of NaOH. Same in case, when we different amount of oxalic acid for each trial. Vacid x Cacid is constant, so there will be no effect on the concentration of NaOH.