hw2solution_pdf - So(dds785 Homework 2 Sutclie(52440 This...

So (dds785) – Homework 2 – Sutcliffe – (52440) 1
This print-out should have 20 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
Read the questions carefully. Look for
whether youve been give or asked for moLaR-
ity or moLaLity! The last half of the questions
require you to consider the vant’Hoff factor i,
for solutes that might dissociate into several
ions, so read carefully. Assume ideal behavior
of solutions in questions 13 through 18. This
covers the remaining material on Exam 1. We
will cover chapter 6 on Exam 2.
001 10.0 points
26 . 6 g sodium nitrate is dissolved in water to
make 550 g of solution.
What is the percent sodium nitrate in the
solution?
10.0 points
What is the molarity of a solution composed
of 7.074 g of HCl in 0.5874 L of solution?
M =
0 . 194021 mol HCl
0.5874 L soln
= 0 . 330304 M HCl
003 (part 1 of 2) 10.0 points
A student investigating the properties of so-
lutions containing carbonate ions prepared a
solution containing 5 . 647 g Na
2
CO
3
in a flask
of volume 250 mL. Some of the solution was
transferred to a buret. What volume of so-
lution should be dispensed from the buret to
provide 7 . 168 mmol Na
2
CO
3
?
Correct answer: 33 . 6345 mL.
Explanation:
m
Na

Explanation:
006 10.0 points
Toluene (C
6
H
5
CH
3
) is a liquid compound
similar to benzene (C
6
H
6
). Find the molal-
ity of toluene in a solution that contains 35.6
grams of toluene and 125 grams of benzene.