Consider how each of the situations described below would affect the experimenta

Question

Consider how each of the situations described below would affect the experimental value determined for mass of calcium carbonate in the antacid tablet. Explain why the experimental mass would be too large, too small, or unaffected because of the situation described. An air bubble is in the tip of the buret at the beginning of the last set of titrations. During the titration, the air bubble is forced out the bottom of the buret tip. The student overshoots the titration during the standardization of NaOH (they have an endpoint that is too pink). During the standardization of HCl, the student adds DI water to their flask to wash down some drops of NaOH. The student assumes the concentration of HCI is exactly 0.300 M instead of their true value of 0.2899 M.

Explanation / Answer

a) The air bubble occupies a volume so you will read a higher volume , experimental mass will be too large

b) You will get a smaller value than the real one, Naoh concentration is lower than real so you will get a mass smaller than real

c) There should be no change

d) Experimental value is too large than real this is because dilution calculations

M1V1 = M2V2

where M is molarity and V is volume , the moles of acid will be higher, and the moles to be neutralized will apparently be more

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