Solutions Questions and Answers

Solids dissolve better and better as temperatures increase Gas dissolves worse as temperatures increase 1 List 3 of the compounds to this graph that are solids How did you know 2 List 3 of the compounds to this graph that are gasses 3 4 Solubility Curves 5 How did you know How many grams of HCl dissolves at 45 C at 20 C How many grams of KNO dissolves at 50 C at 66 C How many grams of NH CI can dissolve at 10 C at 20 C 6 At what temperature do HCl and KNO both dissolve 63 grams of solute 7 For NH what temperature is needed to dissolve 70 g 55g 8 For KCIO what temperature is needed to dissolve 5g 35g 9 Matching Unsaturated solutions Saturated solutions Supersaturated solutions Solute per 100 g of H O g 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Table C Solubility Curves 0 10 20 XA a Hold maximum the solute they can b Holds extra solute c Can hold more solute HCI Saturated Unsaturated Supersaturated Solutions Write S for saturated SS for supersaturated and US for unsaturated NaNO3 KNO SO 30 40 50 60 70 Temperature C 13 On a solubility curve the graphed data point is on the line for the solution 14 On a solubility curve the graphed data point is above the line for the solution 15 On a solubility curve the graphed data point is below the line for the solution 16 More solute could still be dissolved in the solvent at a given temperature NH CH KCI KCIO3 10 Extra solute will settle at the bottom because the maximum saturation point is already reached 11 One more crystal added causes many more crystals to separate from the solution making one large collection of crystals crystallization or forming a precipitate 12 A pinch of salt added to a bottle of water NaC NH 80 90

No Work No Credit Step 1 If the solute is reported in grams you must convert it to moles 45 g NaCl Step 2 Divide moles of solute by the volume in Liters L M moles solute Liters of solution 1 How many moles were used to make 3 00 L of a 6 00 M calcium chlorate solution 58 443 g NaCl 2 What is the molarity of a solution that is composed of 2 00 moles of potassium iodide dissolved in 3 50 L of water 3 What is volume if 2 35 moles of calcium chloride are used to make a 3 0 M solution 4 What volume is used when adding 83 4 grams of sodium nitrate to make a 1 5 M solution Formula 5 What is the molarity of a solution that has 44 3 g of sodium fluoride in 3 00 L of water Formula 6 How many moles were used to make 0 635 L of a 3 00 M strontium chloride solution 7 What is the molarity of a solution that has 109 4 g of cobalt II chloride in 0 250 L of water 8 What volume is used if 1 75 moles of zinc acetate are used to make a 2 1 M solution 9 What is the molarity if 4 25 moles of potassium iodide is dissolved in 7 35 L of water 10 What is the molarity if 125 g of potassium phosphide K P is in 3 00 L of water

4 To how much water should M solution 12 M 1 V 50 Equation M 4 0 V2 Show work Answer

The picture below shows a solution in a beaker The number of red squares represent the amount solute dissolved in the solution Make two drawings of the solution if it was diluted to a total volume of 1 400mL 2 500mL 500ml 400 300 200 W

A scientist has a stock solution with a concentration of 7M If they need 300mL of a 2 20M solution what volume in milliliters of the stock solution would they use to make it Round your answer to two decimal places

A student is carrying out a biological preparation that requires 1 M NaCl to maintain an ionic strength of 1 0 The student chooses to use 1 0 M ammonium sulfate instead Why is this a serious error

A scientist includes 26 14mol of calcium nitrate Ca NO3 2 in a 546mL solution What is the concentration molarity of the solution Round to 2 decimal places

CaCl2 solution If they need 1 26mol of calcium chloride what volume in liters would they need to m

1 How much concentrated 18 M sulfuric acid is needed to prepare 250 mL of a 6 0 solution 18 M V 2 M V2 6 0 250 Show work

10 0 5 pts each A solution begins with molarity of 2 M Some solvent evaporates from the solution What is the new molarity a zero b less than 2 M c 2M d more than 2 M A solution begins with molarity of 2 M More solute is added to the solution What is the new molarity a zero b less than 2 M c 2 M d more than 2 M molarity A solution begins with molarity of 2 M More solvent is added to the solution What is the new b less than 2 M c 2M d more than 2 M a zero A solution begins with molarity of 2 M Half of the solution is poured down the drain What is the new molarity of the remaining solution a zero b less than 2 M c 2 M d more than 2 M

2 Which method of determining the density results in a better measurement of the density Explain why you selected the density you did using the graduate cylinder and triple beam balance or the pipet and analytical balance to enter in Table 1

A solution contains 4 0 oles of work Answer 2 pts 2 pts 5 A bottle contains 9 5 moles of KOH dissolved in water and molarity of the solution is 4 75M What volume of solution is in this bottle show work Answer 2 pts 6 If Dora the Explorer places 72 44 g of H SO into a beaker and fills it to a volume of 274 mL what would be the molarity show work

CuSO4 Crystal The saturated CuSO4 aq shown above is left uncovered on a lab bench at a constant temperature As the solution evaporates 1 0 mL samples of the solution are removed every three days and the SO 2 in the samples is measured It is observed that the SO in the solution did not Change over time Which of the following best helps to explain the observation As the solution evaporates Cu aq and SO 2 aq leave the beaker along with the water molecules A B D As the solution evaporates the dissolution of CuSO4 s in the beaker decreases The evaporation of water is endothermic so more CuSO s dissolves exothermically in the solution which increases the SO Saturated CuSO4 aq As water evaporates more CuSO s precipitates out of the solution in the beaker

A solute is a The substance being dissolved b The substance doing the dissolving A solvent is a The substance being dissolved b The substance doing the dissolving c The mixture after everything is mixed together d The concentration c The mixture after everything is mixed together d The concentration

Question 13 How many mL of 1 02 M LINO3 solution has 7 3 g of solute Question 14 Calculate the mass percent of a solution that has 20 g of NaCl and 100 g of water

Q12 Which of the following is soluble in water A Fe NO3 2 B MgCO3 A 2 92 C Hg l2 Q13 What volume mL of 1 00 M K Cr O7 is required to completely react with 35 0 mL of 0 500 M K Cr O7 aq 6FeSO4 aq 7H SO4 aq Cr SO4 3 aq 3Fe SO4 3 aq K SO4 aq 7H OL B 58 4 D Cas C 29 2 D 9 60

54 2 points The solubility of solids in water generally increases at higher pressures while the solubility of gases in water decreases at higher pressures True False Previous

Solubility g solute 100 g water 100 2 2 2 2 2 2 2 2 2 80 70 60 50 40 30 20 10 0 10 20 30 10 50 60 Substance A Substance B Temperature C 12 According to the graph in Model 2 what is the solubility of Substance A at 30 C 13 Describe the trend in solubility for Substances A and B in Model 2 as temperature increases 14 If a saturated solution of Substance A in 100 0 g of water is cooled from 30 C to 10 C what mass of solid solute would crystallize out Show your work 15 If a saturated solution of Substance B in 50 0 g of water at 30 C is warmed to 50 C what mass of solute would need to be added to make the solution saturated again

1 2 points A solution which contains more than the maximum amount of solute that should be possible to dissolve at a particular temperature is said to be unsaturated saturated Ooo supersaturated

I dissolved 1 5gram of HCI in water the final volume was 250ml Calculate the pH for this solution hink OH H 10 14 and pH log H 5pts Edit View Insert Format Tools Table

A solution is 18 4 m v What is the mass of dissolved solid in 125 mL of the solution

5 5 62 2 points Flat 7 UP i e uncarbonated is O a homogeneous mixture an element a compound O a heterogeneous mixture Previous

A solution is made by diluting 200 mL of a 1 50 mol L standard solution to a volume of 400 mL What is the concentration of the resulting solution

A solution is made by adding 36 7 mL of pure isopropyl alcohol to enough distilled water to make 75 0 mL of solution What is the percent v v of isopropyl alcohol in the sample

27 2 points A 5 glucose solution 5 0g of glucose per 100 mL is administered to a patient at a rate of 1 40 mL min How long will it take for the patient to receive 0 13 lb of glucose 998 min 3570 min 843 min 713 min Previous

Calculate mass of a 4 0 NaOH solution that contains 18 grams of NaOH Enter your answer in grams in the space provided rounded to the nearest whole number do not include units

What volume in liters of a 40 M solution of KBr should be used if 100 moles of KBr is required for a particular experiment Enter your answer in liters rounded to three significant figures do not include units

The maximum amount of solute that can be dissolved into a given amount of solvent at a particular temperature is a an unsaturated solution Ob the solvent OC the solubility d the rate of dissolving e the solute

How many milliliters of a 6 00 M stock solution of HCI would be required to make 200 0mL of a 2 00 M solution Enter your answer in mL rounded to once decimal place in the space provided and do not include units

Calculate the molarity of a solution made by dissolving 32g of KCI in enough water to make 10 L of solution Input your answer in molarity rounded to three significant figures in the space provided do not include units

1 I am learning about solution concentration Can I calculate the concentration of a solution based on percent by mass percent by volume medical concentration and molarity Can I prepare and label a solution of a specific concentration What is the percent by mass of a solution containing 0 852 grams of aluminum nitrate Al NO3 in 4 00 liters assume 4000 g of solution 2 What is the molarity of a solution containing 0 852 grams of aluminum nitrate Al NO3 3 in 4 00 liters of solution Hint You will need your periodic table for this question 3 What is the percent by mass of a solution containing 0 852 grams of barium nitrate Ba NO in 4 00 liters assume 4000 g of solution 4 What is the molarity of a solution containing 0 852 grams of barium nitrate Ba NO in 4 00 liters of solution Hint You will need your periodic table for this question 5 According to problems 1 4 0 852 grams of Al NO in 4 00 liters assume 4000 g of solution will have the same m m a different m m and the same molarity a different molarity 1 than 0 852 grams of Ba NO in 4 00 liters assume 4000 g of solution

A solution was prepared by dissolving 0 62 g of KOH s to form 500 mL of solution The pH of the potassium hydroxide solution is Hint This is a multi step problem 12 35 13 97 10 11

7 How many grams of NaCl are contained in 350 mL of a 0 250 M solution of sodium chloride a 41 7 g b 5 11 g 14 6 g 87 5 g c d 8 What mass of calcium chloride CaCl2 is needed to prepare 2 850 L of a 1 56 M solution a 25 9 g b 60 8 g c 111 g d 493 g 9 A 54 8 g sample of SrCl is dissolved in 112 5 mL of solution Calculate the molarity of this solution 0046

8 What is the pH of a basic solution made by dissolving 40 0 g of NaOH in 12 5 L of water

4 A 325 mL sample of air is at 720 0 torr and 30 0 C What volume will this gas occupy at 900 0 torr and 60 0 C

9 Calculate the density of ammonia gas NH3 at STP Hint Density does not depend on the size of the sample so choose a convenient amount of gas and calculate its volume

10 BaF2 is slightly soluble in water at 25 C with a Ksp 1 5 x 106 Complete parts a c below 6 pts a Write the chemical equation for solid BaF2 dissolving in water b Which of the following best describes the pH of a saturated aqueous solution of BaF circle your answer pH 7 00 pH 7 00 pH 7 00

How many milliliters are in 5 4 Liters O 54 mL O 5 400 mL O 540 mL 0 0054 mL

AB where A rearranges to give B time 0 minutes How many particles of A exist at t 2 min A 0 B 2 C 4 35 Which is a conjugate N H aq H O 1 A N H and H O C N H and N H 36 Which part in this AB electrochemical cell is the anode 3 2 11 11 O time 1 minute acid base pair in the reaction N Hs aq OH aq B N H and OH D N H and OH D 8 O

3 When potassium chloride KCI dissolves in water which of these diagrams would best represent what you would expect to find in solution A B C D K K K K P CL

Which of the following mixtures would best be separated by the process of filtration Owater and oil O water and salt O water and sand water and food coloring

If 42 5 mL of 1 30 M NaOH are required to neutralize 50 0 mL of H SO4 find the concentration of the H SO 2 4

How many milliliters mL of a 2 50 M solution of Ca OH are required to make a diluted 525 mL 2 solution of 0 150 M Ca OH

What is the pH of a solution if the OH is 4 9 x 10 M

The boiling point of pure ethanol is 78 4 C A solution is made using 100 0 g of ethanol the solvent and 12 1 g of glucose What is the boiling point of this solution in C Kb of ethanol is 1 22 C m

The most commonly purchased form of isopropanol C3H8O is a 70 v v solution in water due to its effectiveness as a disinfectant Convert this concentration to a mole fraction of isopropanol P100 isopropanol 0 786 g mL p70 isopropanol 0 88 g mL

Determine how the solubility of a gas in a liquid is affected i e increases decreases or stays the same by the following change Increasing Pressure O Stays the same O Increases O Decreases

Give an example of a solid liquid solution

Is the following mixture is a solution or a suspension colloid Mayonnaise O Suspension Colloid O Solution

5 Points What is the molarity of 0 15 L MgCl2 solution that contains 0 033 moles of MgCl O 0 22 M O 4 5 M O 27 M O 0 0050 M