EAS

Question 1

Reflux is observed when…

Answer 1

the solvent drips steadily back into the reaction.

(About 5 C below boiling point of liquid being distilled)

Question 2

When at reflux, the temperature inside the reaction flask is constant. TF

Answer 2

T

Question 3

The reaction I am running reacts A and B together to make product C. In my flask, I have 15 mmol of A and 20 mmol of B. How many equivalents of B are there compared to A? (round to 2 decimal places)

Answer 3

1.33

Question 4

I am using 5 mL of a 2.5 M solution of NaOH. How many millimoles of NaOH does this correspond to? (use 3 significant figures)

Answer 4

12.5

Question 5

I calculated that my reaction could give me 250 mg of product, but only isolated 175 mg. What is my percent yield (as a %)?

Select one:

Answer 5

70%

Question 6

I have to use 382 mg of phthalic acid in a reaction. Using molecular weight, calculate the millimoles of phthalic acid this corresponds to, with 3 significant figures.

Answer 6

2.30 mmol