In the first lab, you standardized a solution of potassium permanganate (KMnO_4,

Question

In the first lab, you standardized a solution of potassium permanganate (KMnO_4, deep purple crystals) by using it to titrate a standard solution of oxalate. Suppose 10 mL oia 0.046M of oxalic acid was titrated. The titration reaction is given below. Note that a solution of Mn^2+ is colorless. The endpoint of 11.2 ml. was taken as the first discernable pink color. A blank solution gave an endpoint of 1.05 mL Use the titration data to calculate the molarity of the permanganate solution. What is the purpose of the blank titration? Why was an indicator not needed for this titration? Explain the method of endpoint detection in this titration.

Explanation / Answer

Answer:

B) A blank titration is carried out by titrating a fixed and known concentration of titrant into a solvent with zero analyte. The only difference from the regular titration is the absence of analyte. This allows the amount of reactive substance within the plain solvent to be determined and hence allows a determination of the error in future titration experiments using this solvent.

C) KMNO4 acts as self indicator and it has deep color which can be visible by naked eyes hence it doesn't reqiure indicator generally.

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