CHAPTER 14 LABORATORY
Drill 1
- C According to the chart on this page, barium salts will burn with a
green color. We have no information about the burning characteristics of
(A), (B), or (D).
- A Due to its relative volatility, ethyl alcohol will evaporate at a lower
temperature than water. This is a common procedure for the concentration
of this substance. Although phenolphthalein (B) may also be separated by
distillation, this is not a common procedure.
- E A U-Tube manometer will show a rising mercury level as a heated
gas pushes with a greater force per unit area (pressure).
- D Of our common indicators, only litmus is red in acid and blue in
basic solution. Phenolphthalein is clear in acid, and pink in basic solution.
- T, F The indicator will change colors as soon as the solution becomes
slightly basic, which will occur after equivalence, so statement I is
true.
This is a deceptive statement because, although a
neutral solution will have an equal molar amount of H+
and OH− ions, the actual volumes of solution required
to achieve this depend on the concentrations, so
statement II is false.
- F, T Hexane (C 6 H 8 ) has a higher molar mass, and is of the same class of
molecule as pentane (C 5 H 7 ) and therefore will have a higher boiling
point, so statement I is false.
Vapor pressure is a measure of a substance’s propensity
to vaporize, and due to its lower mass, pentane’s vapor
pressure will be higher than hexane’s, so statement II is
