In the table below identify the solute and solvent in each case of the

solutions:

1.

Solutions Solvent Solute

10.0g of

KCl in 100.0g of

water

100.0g of water 10.0g of KCl

30.0 mL

of ethyl alcohol in

40.0 mL

of methyl alcohol

40.0 mL of methyl

alcohol

30.0 mL of ethyl

alcohol

4*2=8

Indicate the solubility of each of the substances below in the two solvents

like water and benzene:

2.

Substance Wate

r (polar

)

Benzene (nonpoloar)

CaCO3

(ionic solid)

Insol

uble

Insoluble

Petroleum

Jelly (nonpolar

solid)

Insol

uble

Soluble

4*2=8

What is percent by mass %(w/w), concentration of NaCl in a solution

prepared by dissolving 14.8g of NaCl of 122g of water?

3.

14.8g NaCl x 100 = 10.8%(m/m)

14.8g NaCl + 122g H2O

A solution with a volume of 425 ml is prepared by dissolving 2.64 moles of

CaCl2 in water. What is the molarity?

4.

Quiz - Chapter 8 - Solutions Quiz

CHEM 1151 - Organic & Biological Chemistry.one (On 1-6-2008).one (On 6-5-2008) Page 1

425 x 1L = 0.425L 103mL

M = 2.64 moles CaCl2 = 6.21M

0.425L

If 7.21g of KCl is dissolved in enough water to prepare 0.333L of solution,

what is the molarity?

5.

7.21g x 1.00 mole = 9.66 x 10-2 moles

74.6g

How many milliliters of water would have to be added to 250.0mL of 2.33M

solution to prepare a 0.551M solution?

6.

Cs x Vs = Cd x Vd Vd = 2.33M x 250.0mL = 1057mL

Cs = 2.33M 0.551M

Vs = 250.0mL

Cd = 0.551M Vd - Vs

Vd = ? 1057mL - 250mL = 807mL of water will be added

Complete the following table on osmolarity: 7.

Molarit

y of Solutio

n

Osmolarity

2M

CaBr2

+ 1M

KBr

CaBr2 -> Ca2 + Br

Osmolarity = 2x3=6

KBr -> K + Br

Osmolarity = 1x2=2

Total: 6+2=8

2m

KCl +

KCl -> K + Cl

Osmolarity = 2x2=4

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KCl + 1M

glucos

e

Osmolarity = 2x2=4

glucoseOsmolarity = 1x1=1

Total: 4+1=5

Indicate which way water will flow across the cell membrane of red blood

cells under each of these conditions:

8.

Condition Water

Flows Into

Cell

Water

Flows Out of

Cell

Cell immersed in concentrated

NaCl solution

X

Cells immersed in physiological

saline solution 0.9%(m/v)

There

is no flow

in or

out

There

is no flow

in or

out

Solution surrounds cell is

hypotonic

X

Indicate whether each of the changes in conditions would affect the solubility

or rate of solution of a given substance

9.

Change of Condition Solubi

lity in Water

Rate of

Solution Formatio

n

Adding more of a solid There

is no effect

Increase

s

CHEM 1151 - Organic & Biological Chemistry.one (On 1-6-2008).one (On 6-5-2008) Page 3

effect

Agitating the solid/solvent

mixture

There

is no effect

Increase

s

What is the percent by volume of isopropyl alcohol in an aqueous solution

made by diluting 75mL of pure acetone with water to give a volume of 785mL of solution?

10.

75mL x 100 = 9.6% (v/v)

785mL

How many grams of Na2S2O3 are needed to prepare 40.0mL of 5.00%(m/v)

Na2S2O3 solution?

11.

50.0mL x 5.00g Na2S2O3 = 2.50g Na2S2O3

100mL

Determine the final concentration of the 20.0mL 5.0 M NaCl solution if 30mL

of water has been added to the solution.

12.

5.0M x 20.0mL = 2.0M

50.0mL

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