Questions Lab 5

# Questions Lab 5 - Questions Name Liz Zharovsky Bench C19...

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Questions: Titration of oxalates Name: Liz Zharovsky Bench #: C19 Lab day and section: Tuesday - 2 Q1: How would each of the following problems in the standardization of KMnO 4 affect the measured value of the KMnO 4 molarity (make it larger, smaller, both larger and smaller or have no effect). Explain why. Specify if the problem that occurs in each measurement affects mostly precision or accuracy of the measurement. Answers: i) wet primary standard : Effect : Smaller molarity of KMnO 4 Explanation : A wet primary standard affects the concentration of the Na 2 C 2 O 4 , as the weight of Na 2 C 2 O 4 will be more than the actual amount of Na 2 C 2 O 4 . This makes the moles of Na 2 C 2 O 4 decrease, making the overall molarity of KMnO 4 decrease. This mostly affects the accuracy of the measurement, as this error affects the concentration of the Na 2 C 2 O 4 and cannot be attributed to randomness. ii) a dirty buret : Effect : Smaller molarity of KMnO 4 Explanation : A dirty buret could affect the volume of KMnO 4
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