How will the following situations affect the final calculation of the molarity of HC2H3O2?A small amount of vinegar adhering to the side of the flask was left unreacted when the endpoint was thought to have reached.After rinsing any drops of vinegar adhering to the side of the flask, another 20 mL of deionized water was added to the vinegar in the falsk.An air bubble was present in the tip of the buret when making the initial volume reading, but not when making the final volume reading. The endpoint of the vinegar titration was surpassed (excess NaOH was added).After the standardization of the NaOH solution using solid H2C2O4•2H2O, the molar mass of anhydrous oxalic acid was used to calculate the molarity of the NaOH solution.

Question
Asked Oct 21, 2019
  • How will the following situations affect the final calculation of the molarity of HC2H3O2?
    • A small amount of vinegar adhering to the side of the flask was left unreacted when the endpoint was thought to have reached.
    • After rinsing any drops of vinegar adhering to the side of the flask, another 20 mL of deionized water was added to the vinegar in the falsk.
    • An air bubble was present in the tip of the buret when making the initial volume reading, but not when making the final volume reading. 
    • The endpoint of the vinegar titration was surpassed (excess NaOH was added).
    • After the standardization of the NaOH solution using solid H2C2O4•2H2O, the molar mass of anhydrous oxalic acid was used to calculate the molarity of the NaOH solution.      
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Step 1

(a)A small amount of vinegar adhered to the side of the flask remains unreacted at the end point of the titration, this means that, a small amount of acetic acid present in vinegar remains unreacted. In such situation, the calculated value of the molarity of vinegar will correspond to the lesser volume of the solution that the actual volume added in the titration flask. Therefore, the calculated value of the molarity of the vinegar solution will be greater than the actual one.

Step 2

(b) On adding 20 mL of deionized water to the titration flask that contains vinegar solution, the conce...

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