Solubility

Multiple Choice

What is the solvent in Lemonade?

• Lemon Juice

• Sugar

• Water

• Ice

Multiple Choice

The instant coffee in a coffee drink is the.........

• Solvent

• Solute

• Solution

• None

Multiple Select

In a soda, what is the solute?

• Water

• Flavoring

• Carbon Dioxide Gas

• Sugar

A) 0.3 g/mL
B) 0.3 g/mL
C) 3.33 g/mL
D) 0.03 g/mL

​

In an experiment, 45 grams of glucose dissolved in 150 mL of water to form a saturated solution at 30°C. What is the solubility concentration of glucose in g/mL at this temperature?

A) 0.3 g/mL
B) 0.3 g/mL
C) 3.33 g/mL
D) 0.03 g/mL

​

In an experiment, 45 grams of glucose dissolved in 150 mL of water to form a saturated solution at 30°C. What is the solubility concentration of glucose in g/mL at this temperature?

The solubility of sodium chloride (NaCl) in water at 20°C is 36 g/100 mL. What is the maximum mass of NaCl that can be dissolved in 250 mL of water at this temperature?

​A) 9 g
B) 36 g
C) 72 g
D) 90 g

The solubility of sodium chloride (NaCl) in water at 20°C is 36 g/100 mL. What is the maximum mass of NaCl that can be dissolved in 250 mL of water at this temperature?

​A) 9 g
B) 36 g
C) 72 g
D) 90 g

A student has 54 grams of potassium nitrate (KNO₃). The solubility of KNO₃ is 32 g/100 mL at 20°C. What is the minimum volume of water needed to completely dissolve this mass at 20°C?

A) 59.3 mL
B) 100 mL
C) 168.75 mL
D) 200 mL

A student has 54 grams of potassium nitrate (KNO₃). The solubility of KNO₃ is 32 g/100 mL at 20°C. What is the minimum volume of water needed to completely dissolve this mass at 20°C?

A) 59.3 mL
B) 100 mL
C) 168.75 mL
D) 200 mL

Multiple Choice

What is the correct formula for concentration in grams per milliliter (g/mL)?

• Volume of solvent (mL) / Mass of solute (g)

• Mass of solute (g) × Volume of solvent (mL)

• Mass of solute (g) / Volume of solvent (mL)

• Mass of solute (g) + Volume of solvent (mL)

Multiple Choice

30 grams of salt is dissolved in 150 mL of water. What is the concentration?

• 5 g/mL

• 0.2 g/mL

• 180 g/mL

Multiple Choice

Which solution is more concentrated?
Solution A: 15 g of sugar in 50 mL of water.
Solution B: 30 g of sugar in 200 mL of water.

• Solution A

• Solution B

• They are equally concentrated

Multiple Choice

A solution has a concentration of 0.75 g/mL. If 120 grams of solute were used, what volume of water was needed?

• 90 mL

• 160 mL

• 0.00625 mL

• 250 mL

Multiple Choice

The concentration of a Kool-Aid solution is 0.4 g/mL. How much sugar is in a 300 mL pitcher?

• 133 g

• 120 g

• 750 g

• 0.0013 g

Multiple Choice

You dissolve 45 g of a powder in 0.5 L of water. What is the concentration in g/mL? (Hint: 1 L = 1000 mL)

• 0.09 g/mL

• 90 g/mL

• 22.5 g/mL

Multiple Choice

A saturated solution has a concentration of 0.25 g/mL. What is the maximum mass of solute that can dissolve in 80 mL of water?

• 3.2 g

• 20 g

• 0.3125 g

• 320 g

Multiple Choice

To make a 0.08 g/mL solution, you have 6 grams of solute. How much water should you add?

• 48 mL

• 75 mL

• 0.48 mL

• 13.3 mL

Multiple Choice

Which of the following solutions has the HIGHEST concentration?

• 2 g in 10 mL (0.2 g/mL)

• 12 g in 40 mL (0.3 g/mL)

• 5 g in 25 mL (0.2 g/mL)

• 100 g in 500 mL (0.2 g/mL)

Multiple Choice

A 0.15 g/mL solution is left out, and 50 mL of water evaporates. What happens to the concentration?

• It decreases

• It increases

• It stays the same

• It becomes zero

Multiple Choice

If you have 80 g of solute dissolved in 400 mL of solvent, what is the concentration?

• 0.2 g/mL

• 5 g/mL

• 320 g/mL

Multiple Choice

You want to make 2 liters of a 0.1 g/mL saline solution. How much salt do you need?

• 0.05 g

• 20 g

• 200 g

• 2000 g

Multiple Choice

A concentrated orange juice has a concentration of 0.65 g/mL. How much juice can you make with 325 g of concentrate?

• 211.25 mL

• 500 mL

• 0.5 L

• 2 L

Multiple Choice

Which of these is a unit for measuring concentration?

• Grams

• Milliliters

• g/mL

• Degrees Celsius

Multiple Choice

A student adds 30 g of coffee to 500 mL of water. What is the concentration of the solution?

• 0.06 g/mL

• 16.67 g/mL

• 0.6 g/mL

Multiple Choice

You are in a hurry to make sweet iced tea. Which method will help the sugar dissolve the FASTEST?

• Using sugar cubes

• Using fine granulated sugar and stirring it in hot tea

• Using rock candy and letting it sit in cold tea

• Using brown sugar instead of white sugar

Multiple Choice

Why do many people prefer to use hot water when making coffee or hot chocolate from a powder?

• Hot water is less expensive than cold water.

• The higher temperature increases the rate of solubility, so the powder dissolves faster and more completely.

• Hot water changes the color of the drink.

• The powders are only soluble in hot water.

Multiple Choice

When a bottle of soda is left open on the counter, it goes flat. This is because:

• The solubility of sugar decreases over time.

• The solubility of CO₂ gas decreases as temperature increases and pressure is released.

• The liquid evaporates, leaving the gas behind.

• The light causes the gas molecules to break down.

Multiple Choice

Fishermen sometimes notice that fish in a lake can die on a very hot, still day. A contributing factor is that:

• The solubility of oxygen gas in the water increases, suffocating the fish.

• The solubility of oxygen gas in the water decreases, so there is less oxygen for the fish to breathe.

• The fish overheat and can not swim.

• The solubility of harmful waste products increases.

Multiple Choice

Why do recipes often instruct you to "season to taste" at the end of cooking soup, rather than adding all the salt at the beginning?

• To make the recipe instructions longer.

• Salt loses its flavor if cooked for too long.

• Adding salt at the beginning makes the meat tough.

• As water evaporates during boiling, the soup becomes more concentrated and saltier.

Multiple Choice

When a diver goes deep into the ocean, the high pressure can cause more nitrogen gas to dissolve in their bloodstream. If they ascend too quickly, this can cause decompression sickness ("the bends") because:

• Their blood heats up too rapidly.

• The saltwater reacts with the nitrogen.

• The change in light intensity affects the gas.

• The decreasing pressure reduces the solubility of the gas, causing it to form dangerous bubbles.

Multiple Choice

Why is it easier to dissolve a bouillon cube in boiling water compared to cold water?

• The boiling water cracks the cube into pieces.

• The cube is designed only for hot water.

• Cold water has a higher density, preventing dissolution.

• The higher temperature increases both the rate and the extent of solubility for the solid

Multiple Choice

When making rock candy, a supersaturated sugar solution is allowed to cool very slowly. A seed crystal is then added. What is the purpose of the seed crystal?

• To add flavor to the candy.

• To cool the solution down faster.

• To provide a site for the excess dissolved sugar to rapidly crystallize onto.

• To make the solution unsaturated again.

Multiple Choice

Why does a can of soda fizz more when you open it warm compared to opening it cold?

• Gases are less soluble in warm liquids, so more CO₂ escapes quickly when the pressure is released.

• The warm can is under higher pressure.

• The aluminum of the can expands when warm.

• The sugar in the soda breaks down when warm.

Multiple Choice

You need to dissolve a large amount of table salt in a glass of water. What is the LEAST effective way to increase how quickly it dissolves?

• Grinding the salt into a fine powder.

• Stirring the mixture vigorously with a spoon.

• Using more salt from the start.

• Using warm water instead of cold.

Multiple Choice

Oil does not dissolve in water because:

• Oil is nonpolar and water is polar; "like dissolves like."

• Oil molecules are too large.

• Water molecules are too polar.

• Oil is less dense than water and floats.

Multiple Choice

Soap is able to clean greasy dishes because a soap molecule has:

• Two polar ends that attract water.

• Two nonpolar ends that attract oil.

• One polar end (attracts water) and one nonpolar end (attracts oil).

• A magnetic charge that breaks down grease.

Multiple Choice

A manufacturer wants to package a highly concentrated liquid fertilizer. To ensure no crystals form in the bottle during storage in a cold warehouse, they must consider the solution's:

• Rate of solubility

• Color and viscosity

• Solubility at the lowest possible storage temperature

• pH level

Multiple Choice

Why do some antacid tablets dissolve faster when dropped in water than others?

• The faster-dissolving tablets are more concentrated.

• The temperature of the water is the only factor that matters.

• The slower tablets are made with a different acid.

• The faster-dissolving tablets are designed with a greater surface area (e.g., porous, fizzy).

Multiple Choice

You are given a small beaker of solution at room temp. You add a bit of solute to the solution and it dissolves. The solution was:

• saturated

• unsaturated

• concentrated

• warm

Multiple Choice

When a solution is saturated:

• No additional material will dissolve in it
• You need to stir it more 
• Two materials have combined to create a clear liquid
• Crystals form 

Multiple Choice

How do you know when you have a saturated solution?

• You don't see anymore material in the solution. It has dissolved.

• The material dissolves and no more will dissolve because you see it collect at the bottom.

• The solution is bubbling and cloudy.

• The solution is clear and there is nothing at the bottom.

Multiple Choice

which solution is saturated?

• I
• II
• III

Multiple Choice

A solution that has more solute than it can hold is called

• saturated
• supersaturated
• unsaturated 
• suspension

Multiple Choice

which solution is supersaturated?

• I
• II
• III

Multiple Choice

At 40°C, the solubility of KCl is approximately 40 g/100g water. A solution with 30 g of KCl in 100g water at 40°C is:

• Saturated

• Unsaturated

• Supersaturated

• Concentrated

Multiple Choice

According to most solubility curves, how does temperature affect the solubility of solids like KNO₃?

• Solubility decreases

• Solubility increases

• Solubility remains constant

• Solubility becomes zero

Multiple Choice

Which salt's solubility is least affected by a change in temperature?

• Potassium Nitrate (KNO₃)

• Sodium Nitrate (NaNO₃)

• Sodium Chloride (NaCl)

• Ammonium Chloride (NH₄Cl)

Multiple Choice

At 70°C, about 140 g of NaNO₃ can dissolve in 100g of water. How much can dissolve in 50g of water at the same temperature?

• 70 g

• 280 g

• 35 g

Multiple Choice

A solution contains 100 g of KNO₃ in 100g of water at 50°C. If it is slowly cooled to 20°C, what will happen?

• More solute will dissolve

• Some solute will crystallize (precipitate) out

• The solution will become unsaturated

• Nothing will happen

Multiple Choice

Which salt has the highest solubility at 20°C?

• KCl (~35 g/100g water)

• NaNO₃ (~90 g/100g water)

• NaCl (~36 g/100g water)

• KClO₃ (~10 g/100g water)

Multiple Choice

The solubility of a gas in water would most likely be represented by a curve that:

• Slopes steeply upward

• Slopes downward

• s a flat, horizontal line

• Is a vertical line

Multiple Choice

How many grams of KCl are needed to make a saturated solution in 200g of water at 60°C? (Solubility ~45 g/100g water)

• 45 g

• 90 g

• 22.5 g

Multiple Choice

A solution with 120 g of NaNO₃ in 100g of water at 40°C would be classified as:

• Unsaturated

• Supersaturated

• Saturated

• Dilute

Multiple Choice

At what temperature do KNO₃ and NaCl have the same solubility?

• 10°C

• 40°C

• ~25°C

• 80°C

Multiple Choice

If 50 g of water is saturated with KNO₃ at 40°C, how much solute is dissolved? (Solubility ~60 g/100g water)

• 50 g

• 30 g

• 60 g

• 110 g

Multiple Choice

What mass of NaNO₃ would precipitate if a saturated solution at 80°C in 100g of water was cooled to 10°C? (Solubility: ~150g at 80°C, ~80g at 10°C)

• 70 g

• 30 g

• 230 g

Multiple Choice

On a solubility curve, a point above the line for a given substance represents a:

• Saturated solution

• Unsaturated solution

• Supersaturated solution

• Dilute solution

Multiple Choice

The solubility of KClO₃ at 50°C is approximately 20 g/100g water. How much water is needed to dissolve 5 g of KClO₃ at 50°C?

• 100 g

• 25 g

• 4 g

• 5 g

Multiple Choice

Which compound shows a DECREASE in solubility as temperature increases?

• KNO₃

• NaCl

• Ce₂(SO₄)₃

• NH₄Cl