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4 notecards = 1 page (4 cards per page)

Viewing:

Postlab for Titration of an Antacid SD

front 1

A student performs this experiment but forgets to remove an air bubble from the N a O H buret valve. During the course of the titration, the air bubble disappeared.

Would the measured volume of N a O H added in the back-titration be incorrectly high, incorrectly low, or will the volume remain unchanged?

  • remains unchanged
  • incorrectly low
  • incorrectly high

back 1

incorrectly high

front 2

A student performs this experiment but forgets to remove an air bubble from the N a O H buret valve. During the course of the titration, the air bubble did NOT disappear.

Would the measured volume of N a O H added in the back-titration be incorrectly high, incorrectly low, or will the volume remain unchanged?

  • remains unchanged
  • incorrectly low
  • incorrectly high

back 2

remains unchanged

front 3

A student was performing this experiment with an antacid tablet which contained C a CO3 but forgot to heat the antacid solution prior to starting the back-titration. As sodium hydroxide was added the student noticed the formation of an insoluble white precipitate.

Would the presence of this precipitate cause the students experimentally determined volume of N a O H be incorrectly high or incorrectly low? Briefly explain.

Hint: Carbon dioxide reacts with water to form carbonic acid.

  • Incorrectly low, the solution becomes less acidic if not boiled gently
  • Incorrectly high, the solution becomes more acidic if not boiled gently
  • Incorrectly low, the solution becomes more acidic if not boiled gently
  • Incorrectly high, the solution becomes less acidic if not boiled gently

back 3

Incorrectly high, the solution becomes more acidic if not boiled gently

front 4

Use the following data to determine the percent mass of C a CO3 in an antacid tablet.

1.064 grams of antacid tablet dissolved

24.42 ml of 0.750 M HCl used to dissolved the tablet

4.02 mL of 1.00 M N a O H for the back-titration

To not type units with your answer.

back 4

67.3