Answer Key
Solubility Curve Worksheet Answers
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University:
Fresno Pacific University -
Course:
CHEM 103 | General Chemistry I Academic year:
2022
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Views:
140
Pages:
8
Author:
gaarmaakbn9h
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Name
SOLUBILITY CURVES
Answer the following questions based
on the solubility curve below
.
1 . Which salt is least soluble in water
at 20° C?
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2
K n f h,
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3. At 40° C, how much potassium
nitrate can be disSolved in 300 g of
water?
120
O04 110
3C
of water at 80° C?
HD„
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130
How many grams of potassium
chloride can be dissolved in 200 g
no8* e*
4. Which salt shows the least change
in solubility from 0° - 100° C?
K)a LSL
i
150
§
90
2
80
1S
•
70
60
50
1
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0
40
30
20
10
5. At 30° C, 90 g of sodium nitrate is
o
20 30
dissolved in 100 g of water. Is this
40
50
60 70 80 90 100
Temperature (0°C)
solution saturated, unsaturated or
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supersaturated?
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A saturated solution of potassium chlorate is formed from one hundred grams of
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ao
water. If the saturated solution is cooled from 80° C to 50° C, how many grams of
precipitate are formed?
7. What compound shows a decrease in solubility from 0° to 100° C?
KT
8. Which salt is most soluble at 10° C?
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9. Which salt is ieast soluble at 50° C?
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10, Which salt is least soluble at 90° C?
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Worksheet: Solubility graphs
Name
*
-
Use the provided solubility graph to answer the following questions:
For questions 1 - 4 an amount of solute is given,
and a temperature is stated. _ If ail of the solute
could be dissolved in 100 g of water at the. given
temperature, would the resulting solution be
unsaturated, saturatedor supersaturated?
1. 60 g KCI at 70 aC
2. 10 g KCI03 at 60 °C l /f \
.
3 80 g NaN03 at 10 °C
4. 70 g CaCh at 20 °C
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Q
-
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^
.
20 .30 40 50 60 70 SO SO 100
Temperature icC )
For questions 5 - 8 a solute and temperature are given. Tei! how many grams of
each solute must be added to 100 g of water to form a saturated solution at the
given temperature.
~ 35
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- 0 . 332 MJ?
Q ’d . hla
L
3+)
5) How many grams of ammoniafNH
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(o
I z. M q l . 0.33S
M
are present in 5.0 L of a
. OSMYSLV 6 LSMO1
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n . oj.,
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solu
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6) I have two solutions. In the first solution , 1.0 moles of sodium chloride is dissolved
to make 1.0 liters of solution. In the second one, 1.0 moles of sodium chloride is
added to 1.0 liters of water. Is the molarity of each solution the same? Explain
your answer.
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\ L 4 I Mo1 - > 1 L
.
7) If I add 25 mT of water to 125 mL of a 0.15 M NaOH solution , what will the
molarity of the diluted solution be?
M,
M ,\j ;
=
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Co ,\"zXo .V>S )- ^CCJ.NSD
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rO . ISM
0 I 2.ST • - ' oTir^ 8) What’s the empirical formula of a molecule containing 65.5% carbon , 5.5% hydrogen , and 29.0% oxygen? z , ^3 ~ / ». 01 * • h s. MM Zt %l ' - 3 rwi / \ . a , ->> , ^ -_ U - (. ?1 9) If the molar mass of the compound in problem is 110 grams/mole, what’s the molecular formula ? / \ ^ ^ \ io Ob * Q 10) 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution . Find the molarity 1 - 4k Ho I O&> a . ^ L 11) 734 grams of molarity. Li,sc4 Wf Ka.CC c AA - &wm4 uuJ? C>, £ j , oaoef 5> L lithium sulfate are dissolved to make 2500 mEHJrsamlJoiTnWnu n C £ 12) 6.7 x 102 grams of Pb molarity. - ^ 7 ^ M - it Hvv ^ the *A r ir * HsOafi are dissolved to make 3.5 mL of solution Find the ' 13) If I make a solution by adding 83 grams of sodium hydroxide to 750 mL of water... a) What is the molality of sodium hydroxide in this solution ? L b) .^ a = c? ens M - a. cns j2 ~n*\ M O' ft " What is the percent by mass of sodium hydroxide in this solution ? C L 4 ) if I 2. c add water to 100 mL of a 0.15 M NaOLI solution until the final volume is 150 mL. what wall the molarity of the diluted solution be? M ,v ( M2 VJ Z Co ,\ L )Co.\% ^ ' ) - O I S L )( J •» * ' - r ‘2 • ' • *> 15) If I make a solution by adding water to 35 mL of methanol (CH OH) until the final 3 volume of the solution is 275 mL... * . a) What is the molarity of methanol in this solution ? (The density of methanol is 0.792 g/mL) n*Lo t M /A c) r G SU tv? * ^ C\r> ii OWOWJP L 0, 2 » ^ " What is the percent by volume of methanol in this solution? 4M* Pl 3 16) What’s the empirical formula of a molecule containing 18.7% lithium , 16.3% carbon, and 65.0% oxygen? . g U / (, A V£1 (1 / ., \U ' ~ lz o\ - Z. ) U 3:CD /H oL ) 3 r 7 If the molar mass of the compound in problem molecular formula? jshis 73.8 grams/mole, what’s the 18) How much 0.05 M HC1 solution can be made by diluting 250 mL of 10 M HC1? fL'V- i'L'L ; 19) How many moles of potassium nitrate are pTOC phosphate react with excess aluminum nitrate? KaP04 + A1(N03)3 -» EQ Os + A1PO * cay\ G3 ^ ^ 5%. o\ V^ ^ pCLi 1 (O U ' to Su when 3.0 moles of potassium ^ K K.JD3 " — , ^J 20) Arcylonitrile, C3H3N, is the starting material for the product.ion of a kind of synthetic fiber acrylics) and can be made from propylene, C &Hs, by reaction with nitric oxide , NO, as follows: 4C3HG (g) + GN ) (g) —> 4C3H3N (s) + 6H O (1) + N3 (g). 2 What mass of C3H3N can be mime when i 1.6% of C3H6 react with 21.6 g of nitric oxide? *21 . Ly V 1vV jD 1 z u M NO W -M N . «r . «rri ,iii«i «iiMJ tli >lwwpWvWtta, £ ' onsr ^ Ov'ra M ^ 4 AL ^ Moii AJO UM.it / \ /u r 0 . t 3 21) How many grams of chlorine gas must be reacted with excess sodium iodide if g of sodium chloride are needed? CJ , 4 Q ? NA CJ Y-T \Q ^ \ KA .O \ 22) Balance(7H203 -> ^ \ ~ LjAl + lg ^ 2 < 02 ^ %% . ... . .. hi . ’ • Name: Period: Le Chatelier’s Principle Worksheet #1 1 ) For the reaction below, which change would cause the equilibrium to shift to the right? 3 males 5 >v\ole s " ' - Heat + CH4(g) + 2 H2S(g) ++ CSi ( g ) + 4 Bj ( g ) (a ) Decrease the concentration of dihydrogen sulfide — ^— (c ) Increase the temperature of the system. p( (d) Increase the concentration of carbon disulfide. (e) Decrease the concentration of methane. | - - iffjr Ar O^.Oj ' JH , 2) What would happen to the position of the equilibrium when the following changes are made to the equilibrium system below? 2S03(g) <-* 2SOz(g) + 02(g) /wol L(a ) Sulfur dioxide is added to the system. <— ( b ) Sulfur trioxide is removed from the system. (c) Oxygen is added to the system. 2 3) What would happen to the position of the equilibrium when the following changes are made to the reaction below? 0 2HgO(s) <- Hg(l) + 02(g ) (a) HgO is added to the system. ( b ) The pressure on the system increases. 4i S» o\( dis — /li \\ojs~Q. 0 cS OA - 4) When the volume of the following mixture of gases is increased, what will be the effect on the equilibrium position? 4HCl(g) + 02(g) <-> 2BbO(g) + 2Cb(g) H v< ° ' \ V — ^ — ^ a>2H2 2N O(g) ~~ 3 \ 0' ( b) $*05(5} A-HF(g) <-> SiF4g + 2H20(g) y $0 H 3 (c) CO(g) 112(g) OS + H20(g) b. Decrease SCN-(aq) concentration c. Decrease in AgSCN(s) concentration o ^ ^ 02 S (g) + J_02(g) ^ _S03(g) a. Increase the amount of 0, b. Increase the pressure applied to the system [ttS c. Decrease the pressure applied to the system 4 2. _ . ^ * — 3. _ .N204(g) ^ _N02(g) a. Increase the pressure applied to the system: b. Decrease the pressure applied to the system: c. Decrease the amount of NQ : 2 l L ^—— ^ 4. _LC(S) +_ Lc02(g) + heat ~ AcO(g) a. Increase the temperature of the system: b. Increase the pressure applied to thp system: 0 c. Increase the amount of C(s): 5.( H2(g) +i_l2(g) + 51.'9kJ AHI(g) a. Decrease the temperature of the system: 4 b. increase the pressure applied to the system: 0 c. Increasing the amount of l2: ~ — —^ 6. £ iNH3 (g) + 5_02(g) ^ M _ N0 (g) + 6_H 20 (g) a. The pressure of oxygen is increased by injecting one additional mole of oxygen into the reaction vessel. b. A desiccant (material that absorbs water) is added to the system c. The system is compressed and the ammonia liquefies, f — ~ S02 (g) + 02 {g) JLS03 (g) a. Additional S02 (g) is added to the system. 7 , , t b. A catalyst is added. c. The volume of the reaction vessel \o o\ _ \ 'f \ $ c QS 'O. \ C\ £ / decreases. (Hint: What happens to the pressure of the reaction vessel?) Vu 3 \ \Z 9is ( Hf ~ a. the reaction^ were performed at a lower temperature? — b. the gases were removed as they were formed? — ^ c?) e reaction took place in a very was where — (NHJ^QQ ( + 3 humid are ? g) + ^ ^ there a significant amount of water vapor in the air ? 10. The following reaction is exothermic What would be the effect on the position of equilibrium if: ! C2H (g) +JL Br (g) 2 2 J_C2H2Br2 (g) a. the temperature was increased. b. the pressure on the system was increased. c. the addition of a catalyst. A/ v\fi n / Pfefl 11. GottaGrow Industries, a fertilizer production company, hired you as a production consultant because of your expertise with LeChatleier’s Principle. They are looking for ways to maximize the production of ammonia (NH3) from the following reaction, what suggestions would you make? Explain, chemically, why you made the suggestions you did! _LN2(g) + 3_H2(g) ~ JLNH g) ( + 92.5kJ 3 Of 0*3
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