Author Question: You open your laboratory drawer to prepare your glassware for an experiment. You find that your ... (Read 33 times)

Yolanda · **on:** Aug 23, 2018

You open your laboratory drawer to prepare your glassware for an experiment. You find that
your round-bottom flask is attached so firmly to your distillation adapter that you cannot take
them apart.
(a) What should you have done when storing your glassware during the previous lab period?
(b) How can you get the two pieces of glassware apart?

Question 2

Many student laboratories employ heating mantles for heating reaction mixtures. These
devices should not be plugged directly into the electrical outlet. Why?

jesse.fleming · **Reply #1 on:** Aug 23, 2018

Answer to Question 1

(a) Taken it apart.
(b) Hot water, a gentle rap on the bench top.

Answer to Question 2

Heating mantles are not designed to operate at 110 volts. Instead, the mantle is plugged into a
variable transformer which is used to adjust the voltage and thus the temperature.
(a) CH3CO2H + NaOH
(b) H2NCH2CH2CH2NH2 + HCl (12 M)
CH
3CO2Na + H2O
ClH
3NCH2CH2CH2NH3Cl
+ +
25.0 g 10.0 g
5.0 g 10.0 mL
14 You open your laboratory drawer to prepare your glassware for an experiment. You find tha