Document 6523134

Water and Solutions
Homework 13.1
1. Water is a polar molecule. What does "polar" mean? lÿ(,ÿ '
2. Water molecules are held together by ( ÿTRoNGÿWEAK )
hydrogen bonds.
3. Why does water have a relatively high boiling point? ! vÿ , t l
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4. Solid water (ice) takes on a 3 dimensional shape that contains much
more empty space than water.
e How does this explain why ice floats in water? /ÿ,,ÿ,' ÿ'ÿ ÿ., ,ÿ ÿ -
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5. What does"l"ÿKe dissolves" like" mean? ÿ¢)1C!ÿ( ,3, d>,-,/ÿ' ' ÿ'"*:, ,ÿ ,, ,4/ÿ
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Solutions
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Water and Solutions
Homework 13,1
6. What is a solution? ('ÿ \fÿ('ÿ7"ÿ'w) (.\(ID, WI"ÿt) ÿ i'Yÿi :,,ÿ tÿ,\,'q,
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What is an aqueous so utionT, m ,ÿ,ÿlÿ.,i<: </JI.ÿ,sSÿ/,"//
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To make chocolate milk, you stir 2 spoons oftchocolate
syruplinto 2
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cups dfÿmil CIRCLE the solvent and BOX the solute.
9. For each action, write whether it would increase (T), decrease (D),
or have no effect (N), on the solubility of the solid solute.
a. Decreasing the temperature of the solution i/ÿ
b. Decreasing the pressure over the solution /\1
c. Adding a nonpolar solute to a polar solvent tÿ'ÿ!
10. For each action, write whether it would increase (T), decrease (D),
or have no effect (N), on the solubility of the gaseous solute.
a. Placing a soda in the refrigerator i!i/
b. Increasing the temperature of the solution !)
c, Decreasing the pressure around the solution ! J
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Water and Solutions
Homework 13.1
11. For each action, write whether it would increase (I), decrease (D),
or have no effect (N), on the RATE of solubility of the solute.
a. Using a packet of sugar instead of a sugar cube
b, Heating up a sugar and tea solution ÿ!ÿ/
c. Stirring a solid solute into a solution of water /
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12. Circle the below compounds that are electrolytes.
a. CCI4
ÿd, BaO "ÿ)
b. SF6
e. PH3
13. List two pairs of liquids that YOU know of that are miscible.
14. List two pairs of liquids that are immiscible.
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Solutions
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Homework 13.2
Solubility Graphs
Temperature - Solubility Relationships
200
NAN03
180
NaC2H302
L
o 160
i
RbCI
140
0
LiCI
"ÿ 120
@
100
80
©
o9
S 6o
KCl
i
NaCI
2o
©
rJÿ
0
0
20
40
60
8O
IO0
Temperature (°C)
Use the graph to answer all questions.
1. How much KNO3dissolves in 10Og of water that is 30°C?
2. How much KNQdissolves in 100 g of water that is 70°C?
17_ q
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3. How many grams of KCI will dissolve in 200 g of water at45°C?
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4. How many grams of NaNQ are required to make a saturated
solution in 100.0 g of water at 70 °C?
,
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How much NH4CI will dissolve in 50.0 grams of water at 70 °C?
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Solutions
Molarity and Dilution
Homework ÿ%ÿ%!'
6ÿ\Aÿtÿhat temperature will a saturated solution of SQ hold 20 grams
,\
iÿof%elute?
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As the_temperature of the solution increases, the solubility of LiCI
:(!NCREASES DECREASES).
,
The solubility of KI( INCREASES / DEcREAsEs )ÿvith a decrease in
temperature.
,
Circle the correct description of each solution.
a. 50,0 g of KCI in 100.0 g of water at 80 °C
( U nsatu rated ÿiSatu rated>/su persatu rated )
b, 135 g of KI in 100.0g of water at 90 °C
( U nsatu rated / Satu rated/(Sÿupersat u rated, )
c. 40.OgofNaNQinS0.0gofwateratlOOC
%ÿ(ÿi ÿ'ÿlÿ)ÿ.iÿ\ÿ(:ÿ
(Unsaturated/(Saturatedÿy Supersaturated)
d. 26,0 g of NaCI in 100,0 g of water at 80 °C
(ÿ 13ÿnn%ÿu-iÿd)/Satu rated / S u persatu rated )
10. 150 grams of NaNQ are in 100 mL of water at 40.0 °C. If more
NaNQ is added, will it dissolve? (YES/(.ÿLOÿ )
11. At what temperature is the solubility of NaNQ equal to the
solubility of KNQ?
ÿ/ÿ1%ÿ,
12, 25.0 grams of CsCI is placedf.,in 100,0 grams of water at 2S,O °C, Will
all of the CsCI dissolve? ÿYÿEÿ / NO )
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5olutions
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Molarity and Dilution
Homework 13,3
What is the molarity of 1,5 L of solution that contains 0,50 mol
.
MgCI2?
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2, What is the molarity of 250 mL of solution that contains 0,70 tool
NaCI?
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How many moles of solute are present in 1.5 L of 0,24 M Na2S04?
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How many grams of CaCI2 are in 250 mL of 2.0 M CaCI2 solution?
= .7"_50 L.
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5olutions
Solubility Graphs
Homework43ÿ2-
5. What is the molarity of a solution made by dissolving 80.0 grams of
NaOH in one liter of solution?
,
Ill have 0,60 moles of sodium iodide how much water would it take
to make a 0.25 M solution?
,
HOW _many mL of initial solution of 2.00 M MgSO4 would you need
to prepare 100.0 mL of 0.400 M MgS04?
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If yOU need 250 mL of 0,20 M NaCI, what vo ume of a I.,0 M NaCI,
solution do you need7
1\4 !'x!ÿ - iv].ÿ_ \I:,
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Homework 13.3
Molarity and Dilution
9. You dilute 50.0 mL of 5.0 M NaCI to make a °500.0 mL of solution,
what is the mÿarityo of the dilute solution?
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10. How many li[ers of_15_MM sodium nitrate are needed make 225 mL of
a 0,100 M solution?
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11. If you had 43;_O__mL of a 3.00 M hydrochloric acid solution and you
dilute it to 500 mL, what is the new molarity?
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C. !,ÿ, or) !'P<)(. 'ÿ ;,ÿ) ,, ,,ÿ '!
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.Solutions