Reference no: EM132412921

QUANTITATIVE ANALYSIS - Acid Base Titrations with Volumetric Dilution

1. In an acid-base titration, an indicator is used to visually determine the equivalence point.

a. What indicator will be used in today's experiment?

b. What color is this indicator at pH > 8?

2. Determine the concentration (molarity) of your diluted NaOH solution (procedure step (A.7)). The following problem is an example of the calculation you will use to determine the molarity of your diluted NaOH solution:

To accomplish the titration, a NaOH stock standard solution of concentration 3.065M is diluted by pipeting 25.00mL of the stock solution into a 500mL volumetric flask and then diluting the stock to a total volume of 500.00mL with DI water. Calculate the concentration of the new solution.

(Hint: Example (1) on the "calculation help-sheet" can be used to help solve this problem.)

3. Once you have diluted your stock NaOH solution you will then use the resulting diluted solution to determine the concentration (molarity) of an oxalic acid solution (procedure step (C.28)). The following problem is an example of the calculation you will use to determine the molarity of the acid:

Calculate the molarity of an oxalic acid solution, H2C2O4(aq), if a 10.00 mL sample of the oxalic acid solution requires 25.80 mL of 0.1573M NaOH to neutralize it in a titration. (Hint: Example (2) on the "calculation help-sheet" can be used to help solve this problem.)