What would be the effect of each of the following sources of error on the molarity of H2SO4 determined in this experiment? State whether the concentration of H2SO4 obtained would be too high or too low. Explain your answer briefly. a. The burette is contaminated with an acid solution.
[1 mark]

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b. The burette contains a large air bubble in the tip, which disappears during the titration [1mark]

c. A small volume of the acid is spilled when you transfer it into the Erlenmeyer flask
[1 mark]

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

b) nuclear ive learned that in a pedtrodic table

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.