While preparing the samples for analysis, you forgot that you already added phenolphthalein indicator so you added some more. What will be its effect in the volume of the titrant needed to reach the endpoint? Select one: A. Increase B. Decrease C. No effect D. Cannot be determined Primary standards are used to determine the exact concentration of the titrant. Based on the criteria of primary standards, which of the following cannot be used as a primary standard? Select one: A.Oxalic acid B. Sodium hydroxide C. Sodium carbonate D. Potassium dichromate During titration, you notice that the retention of the faint pink color is longer than earlier. Your lab partner suggested that you add a “half-drop” to prevent over-titration of the analyte solution. Is it ethical to do the “half-drop” technique? Select one: A. NO. It will cause error in calculations if you forgot to record the volume reading before adding the half-drop. B. YES. No error in calculations will be encountered provided that the volume reading is recorded prior to adding of the half-drop. C. Neither A nor B D. Cannot be determined
While preparing the samples for analysis, you forgot that you already added phenolphthalein indicator so you added some more. What will be its effect in the volume of the titrant needed to reach the endpoint?
Select one:
A. Increase
B. Decrease
C. No effect
D. Cannot be determined
Primary standards are used to determine the exact concentration of the titrant. Based on the criteria of primary standards, which of the following cannot be used as a primary standard?
Select one:
A.Oxalic acid
B. Sodium hydroxide
C. Sodium carbonate
D. Potassium dichromate
During titration, you notice that the retention of the faint pink color is longer than earlier. Your lab partner suggested that you add a “half-drop” to prevent over-titration of the analyte solution. Is it ethical to do the “half-drop” technique?
Select one:
A. NO. It will cause error in calculations if you forgot to record the volume reading before adding the half-drop.
B. YES. No error in calculations will be encountered provided that the volume reading is recorded prior to adding of the half-drop.
C. Neither A nor B
D. Cannot be determined
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