Pre-lab questions: Q 1. Based on the Three Source of Error Three sources of error in...

Pre-lab questions:

Q 1. Based on the Three Source of Error

Three sources of error in acid-base titration

1. We notice the colour change of the solution due to presence of indicator at the end point (one extra drop from buret added to solution in conical flask after equivalence point) and not at the equivalence point (when a number of moles of acid=number of moles of base).

2. Parallax error: When we take the reading of solution in the buret from an angle rather than looking straight at the lower meniscus in colorless solutions and upper meniscus in colored solutions, this gives an error in the final calculation of the molarity of our acid.

3. The precision of the buret: Some burets may be less precise than others in giving the correct reading. This increases the uncertainty in the measurement of the volume of titrant used.

a) Give specific ways that you might avoid each one

b) During titration of an acid with a base, the sides of the Erlenmeyer flask are washed with distilled water. Do you think this rinsing will affect the outcome of the titration? Why or why not?

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