A student performs this experiment but forgets to remove air bubbles from the NaOH buret valve. (a) Would the measured volume of NaOH added in the back-titration be incorrectly high or low? (b) How would this error affect the results of the experiment?Question 2 options: (a) incorrectly low (b) % CaCO3 incorrectly high (a) incorrectly high (b) % CaCO3 incorrectly high (a) incorrectly low (b) % CaCO3 incorrectly low (a) incorrectly high (b) % CaCO3 incorrectly low

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Asked Nov 15, 2019
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A student performs this experiment but forgets to remove air bubbles from the NaOH buret valve. (a) Would the measured volume of NaOH added in the back-titration be incorrectly high or low? (b) How would this error affect the results of the experiment?

Question 2 options:

 

(a) incorrectly low (b) % CaCO3 incorrectly high

 

(a) incorrectly high (b) % CaCO3 incorrectly high

 

(a) incorrectly low (b) % CaCO3 incorrectly low

 

(a) incorrectly high (b) % CaCO3 incorrectly low

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Expert Answer

Step 1

The percentage of calcium carbonate (CaCO3) in a sample is calculated using the back titration method as CaCO3 is insoluble in water. First, a large amount of HCl than required is added to the sample. The extra amount of HCl is back titrated using NaOH solution.

Step 2

The presence of air bubble in the burette valve may or may not affect the volume measurement. If air bubble slips during the titration, there will be an ...

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