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Table of contents

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1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 21m
3. Ionic Compounds2h 17m
4. Molecular Compounds2h 14m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 37m
7. Energy, Rate and Equilibrium3h 39m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 31m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines38m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 46m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m

9. Solutions

Percent Concentrations

9. Solutions

Percent Concentrations - Video Tutorials & Practice Problems

Previous Topic: Solutions: Mass Percent

Next Topic: Molarity

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Percent Concentrations deal with the amount (in mass of volume) of solute found within a given solution.

Mass and Volume Concentrations

1

concept

Percent Concentrations Concept 1

Video duration:

52s

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Now recall that mass percent is the percentage of a given salute ingram's within a solution. Also in grams. And what we can understand is that additionally, we can use mass slash volume and volume percent formulas to express solution concentrations. Now here we're going to deal with what we call mass volume, abbreviated as M slash v percent concentration. We're going to say this represents a percentage of a given salute in grams dissolved in a given volume in milliliters of solution. So that means that our MV formula equals g of our salute, divided by ml of solution times 100%. So this will allow us to calculate the mass volume percentage for any given solution.

2

example

Percent Concentrations Example 1

Video duration:

55s

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A solution was prepared by dissolving 13.5 g of potassium nitrate in sufficient water to produce 85 ml of solution. What is the mass volume percentage of this solution? Alright, so m so we're gonna stay here? M. V percentage equals the grams of our salute, divided by milliliters of our solution Times 100%. Here are salyut is the potassium nitrate, so that's 13.5 g of potassium nitrate, Divided by the mls of solution, which is 85 Times 100%. When we do that, we get 15.9%. As our final answer here, the answer has three sig figs, because both 13.5 and 85.0 also have three significant figures.

3

concept

Percent Concentrations Concept 2

Video duration:

26s

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With volume volume percentages, we say, it represents a percentage of given salyut in middle leaders dissolved in a given volume of milliliters for solution. So that means that our volume volume percentage, so volume volume is abbreviated as v slash v percentage equals the mls of solute, divided by the mls of solution times 100%.

4

example

Percent Concentrations Example 2

Video duration:

1m

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here, we're told us 750 ml bottle of Listerine contains mls of ethanol. What is the volume volume percentage of this list during cleaning solution? All right, so, we're gonna say here, volume volume percentage equals the mls of salute, divided by the mls of solution Times 100%. So our salute is the is the ethanol. So it's 100 and 50 mls of ethanol. No, you don't need to know what the formula is here. I'm providing it, but you don't need to know it for this topic, divided by the Ml solution. Now, here's the thing. The solution is the 750 bottles of Listerine. So that's the entire amount of the bottle in terms of volume represents the volume of the solution So that the 750 mls of the solution Times 100%. So when we do that, we're gonna get here 20 as our percentage, our volume volume percentage. So here 150.0 has 46 figs. 1 50 has 26 figs. So I write it as 20 dot to signify that I have two significant figures with that volume volume percentage that I've obtained.

5

Problem

Problem

How many mL of ethanol are contained in a 750.0 mL bottle of wine that contains 11.0% (v/v) of ethanol?

A

1.5 mL

B

68.2 mL

C

82.5 mL

D

11.0 mL

6

Problem

Problem

Calculate the grams of solute needed to prepare the following:450 mL of a 2.0% m/v KOH solution.

A

1.1 g

B

9.0 g

C

4.5 g

D

2.3 g

7

Problem

Problem

What is the mass/volume percent concentration of the following solutions:0.075 mol sucrose (C₁₂H₂₂O₁₁) in 270 mL of solution.

A

5.0 m/v %

B

2.8 m/v %

C

6.7 m/v %

D

9.5 m/v %

8

Problem

Problem

The pain reliever ibuprofen is sold as an oral suspension for children 2-11 years of age. How many milligrams would you obtain in a 2.7 tsp dose if it contains 100 mg per 5 mL? (1 tsp = 5 mL)

A

1.0×10² mg

B

67 mg

C

2.7×10² mg

D

54 mg

Do you want more practice?

We have more practice problems on Percent Concentrations

Previous Topic: Solutions: Mass Percent

Next Topic: Molarity

Additional resources for Percent Concentrations

PRACTICE PROBLEMS AND ACTIVITIES (13)

A mouthwash contains 22.5% (v/v) alcohol. If the bottle of mouthwash contains 355 mL, what is the volume, in m...
What is the difference between a 5.00% (m/m) glucose solution and a 5.00% (m/v) glucose solution?
What is the difference between a 10.0% (v/v) methanol (CH₄O) solution and a 10.0% (m/m) methanol solution?
Calculate the mass/volume percent (m/v) for the solute in each of the following: a. 75 g of Na₂SO₄ in 250 mL ...
Calculate the grams or milliliters of solute needed to prepare the following: c. 250. mL of a 10.0% (v/v) ace...
A dilute aqueous solution of boric acid, H₃BO₃ is often used as an eyewash. How would you prepare 500.0 mL of ...
What is the mass/volume percent concentration of the following solutions? a. 0.078 mol KCl in 75 mL of solutio...
How many moles of each substance are needed to prepare the following solutions? a. 50.0 mL of 8.0% (m/v) KCl (...
A patient receives 100. mL of 20.% (m/v) mannitol solution every hour. b. How many grams of mannitol does the...
A patient needs 100. g of glucose in the next 12 h. How many liters of a 5% (m/v) glucose solution must be giv...
Nalorphine, a relative of morphine, is used to combat withdrawal symptoms in heroin users. How many milliliter...
An 80-proof brandy is a 40.% (v/v) ethanol solution. The 'proof' is twice the percent concentration of alcohol...
A solution is prepared with 70.0 g of HNO₃ and 130.0 g of H₂O. The HNO₃ solution has a density of 1.21 g/mL. (...

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