How to calculate percent concentration | Percent mass | Percent volume | Percent mass-volume - Dr K

ChemSimplified
15 Sept 201803:32
EducationalLearning
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TLDRThis video tutorial offers a clear guide on calculating percent concentration in three distinct methods: percent mass, percent volume, and percent mass-volume. It explains that percent mass concentration is determined by dividing the mass of the solute by the mass of the solution and multiplying by 100. Percent volume concentration is calculated by dividing the volume of the solute by the volume of the solution, also multiplied by 100. Percent mass-volume concentration involves dividing the mass of the solute (in grams or kilograms) by the volume of the solution (in ml or liters) and then multiplying by 100. The video provides examples to illustrate each formula, helping viewers understand how to apply these concepts in practice. It concludes with a recap of the formulas and an invitation to subscribe for more educational content.

Takeaways
  • 🧪 Three methods of calculating percent concentration are discussed: percent mass, percent volume, and percent mass-volume.
  • 📐 Percent mass concentration is calculated by dividing the mass of the solute by the mass of the solution and multiplying by 100%.
  • 📏 Units for mass must be consistent (e.g., both in grams or both in kilograms) for percent mass concentration calculations.
  • 🌡 Percent volume concentration is found by dividing the volume of the solute by the volume of the solution and multiplying by 100%.
  • 📐 Units for volume must be consistent (e.g., both in milliliters or both in liters) for percent volume concentration calculations.
  • 🤹 Percent mass-volume concentration combines mass and volume, requiring the mass of the solute in grams (or kilograms) and the volume of the solution in milliliters (or liters).
  • 🔍 The formula for percent concentration always has the solute on top and the solution on the bottom, multiplied by 100%.
  • 🔢 The 'solution' in these formulas refers to the combined mass or volume of the solute and solvent.
  • 📈 An example calculation is provided for percent mass concentration using 65 grams of solute and 280 grams of solution, resulting in a 23% concentration.
  • 💧 An example is given for determining the volume of a solution when given a 25% volume concentration and the volume of HCl, resulting in a 48 ml solution.
  • 📉 The final example demonstrates calculating percent mass-volume concentration with 175 grams of solute and 630 ml of solution, yielding a 27.8% concentration.
  • 👍 The video aims to be helpful and encourages viewers to subscribe for more educational content.
Q & A

  • What are the three types of percent concentration discussed in the video?

    -The three types of percent concentration discussed are percent mass, percent volume, and percent mass-volume.

  • How is percent mass concentration calculated?

    -Percent mass concentration is calculated by dividing the mass of the solute by the mass of the solution and then multiplying by 100 percent.

  • What units can be used for mass when calculating percent mass concentration?

    -Any consistent units can be used for mass as long as both the mass of the solute and the mass of the solution are in the same units.

  • What is the formula for percent volume concentration?

    -Percent volume concentration is calculated by dividing the volume of the solute by the volume of the solution and then multiplying by 100 percent.

  • How does the calculation of percent volume concentration differ from percent mass concentration?

    -The difference lies in the units used; for percent volume concentration, the volume of the solute and solution are used instead of mass.

  • What is percent mass-volume concentration and how is it calculated?

    -Percent mass-volume concentration is calculated by dividing the mass of the solute (in grams or kilograms) by the volume of the solution (in ml or liters) and then multiplying by 100 percent.

  • What is the common factor in all three percent concentration formulas?

    -The common factor is that the solute is always on the top and the solution is always on the bottom, and the result is always multiplied by 100 percent.

  • What does the solution consist of according to the script?

    -The solution consists of the solute plus the solvent.

  • In the example given, what is the percent mass concentration of a solution with 65 grams of NaCl and 280 grams of solution?

    -The percent mass concentration is 23%, calculated by (65/280) * 100.

  • How can you find the volume of the solution if you know the volume of HCl and the percent volume concentration is 25%?

    -You can set up the equation 25% = (12 ml / volume of solution) * 100 and solve for the volume of the solution, which would be 48 ml.

  • What is the percent mass-volume concentration of a solution with 175 grams of solute and 630 ml of solution?

    -The percent mass-volume concentration is 27.8%, calculated by (175/630) * 100.

  • What is the main takeaway from the video regarding the calculation of percent concentrations?

    -The main takeaway is understanding the different formulas for calculating percent concentrations and how to apply them based on the given information about the solute and solution.

Outlines
00:00
🧪 Understanding Percent Concentration Calculations

This paragraph introduces the concept of calculating percent concentration in three different ways: percent mass, percent volume, and percent mass-volume. It explains that percent mass concentration is calculated by dividing the mass of the solute by the mass of the solution and multiplying by 100%. The importance of using consistent units for mass is emphasized. Percent volume concentration is similarly calculated using volumes, with the volume of the solute divided by the volume of the solution, again multiplied by 100%. Percent mass-volume concentration is unique in that it divides the mass of the solute by the volume of the solution, requiring grams for mass and milliliters for volume. The paragraph concludes by highlighting the similarity in the formulas, where the solute is always on top and the solution on the bottom, each multiplied by 100%. Examples are provided to illustrate the application of these formulas, including calculating percent mass with given masses, determining the volume of a solution when given the volume of a solute and a percentage, and finding the percent mass-volume concentration with given mass and volume.

Mindmap
Keywords
💡Percent Concentration
Percent concentration is a measure of the proportion of a solute in a solution, expressed as a percentage. In the video, it is the central theme and is discussed in three different forms: percent mass, percent volume, and percent mass-volume. The script explains how to calculate each type, emphasizing the importance of using consistent units for mass or volume in the calculations.
💡Percent Mass Concentration
Percent mass concentration is defined as the mass of the solute divided by the total mass of the solution, multiplied by 100 percent. It is one of the three methods explained in the video for calculating percent concentration. The script illustrates its calculation by using an example where 65 grams of NaCl (solute) is divided by 280 grams of the solution, resulting in a 23% mass concentration.
💡Percent Volume Concentration
Percent volume concentration is calculated by dividing the volume of the solute by the total volume of the solution and then multiplying by 100 percent. It is another form of percent concentration discussed in the video. The script provides an example where the volume of HCl (solute) is given, and the task is to find the volume of the solution, resulting in a 25% volume concentration.
💡Percent Mass-Volume Concentration
Percent mass-volume concentration is calculated by dividing the mass of the solute by the volume of the solution and then multiplying by 100 percent. The units for mass must be in grams or kilograms, and for volume, it must be in milliliters or liters. The script uses an example with 175 grams of solute and 630 ml of solution to demonstrate a 27.8% mass-volume concentration.
💡Solute
A solute is the substance that is dissolved in a solvent to form a solution. In the context of the video, the solute is the component whose concentration is being calculated in the solution. The script mentions NaCl and HCl as solutes in different examples of calculating percent concentration.
💡Solution
A solution is a homogeneous mixture of two or more substances. In the video, the solution is the combination of the solute and the solvent. The script emphasizes that when calculating percent concentration, the solution's mass or volume includes both the solute and the solvent.
💡Mass
In the context of the video, mass refers to the measure of the amount of matter in an object, typically measured in grams or kilograms. The script discusses how mass is used in the calculation of percent mass concentration and percent mass-volume concentration, where consistent units are crucial.
💡Volume
Volume, as discussed in the video, is the measure of the space occupied by a substance, commonly measured in milliliters or liters. It is a key component in calculating percent volume concentration and percent mass-volume concentration, where the script illustrates the importance of using the same units for both the solute and the solution.
💡Consistent Units
Consistent units are essential in calculations to ensure accuracy. The video script stresses the importance of using the same units for mass or volume when calculating percent concentration. This is demonstrated in examples where grams are used for mass and milliliters for volume, ensuring that the calculations are valid.
💡Formula
A formula in the context of the video refers to the mathematical expressions used to calculate different types of percent concentrations. The script outlines three formulas: for percent mass, percent volume, and percent mass-volume concentration, each highlighting the relationship between the solute and the solution in the calculation.
💡Example
Examples in the video serve to illustrate the application of the formulas for calculating percent concentrations. The script provides specific examples with substances like NaCl and HCl, showing step-by-step calculations that lead to the determination of percent concentrations such as 23%, 25%, and 27.8%.
Highlights

Introduction to calculating percent concentration in three ways: percent mass, percent volume, and percent mass-volume.

Percent mass concentration formula: mass of solute divided by mass of solution times 100%.

Uniformity of mass units is required for percent mass concentration calculation.

Percent volume concentration formula: volume of solute divided by volume of solution times 100%.

Uniformity of volume units is necessary for percent volume concentration calculation.

Percent mass-volume concentration formula: mass of solute divided by volume of solution times 100%.

Mass must be in grams or kilograms, and volume in ml or liters for percent mass-volume concentration.

Similarity in formulas: solute on top, solution on bottom, multiplied by 100%.

Solution is defined as the sum of solute and solvent.

Example calculation of percent mass concentration using mass of NaCl and solution.

Result of the first example: 23% percent mass concentration.

Example calculation of percent volume concentration using volume of HCl.

Result of the second example: 48 ml volume of solution.

Example calculation of percent mass-volume concentration using mass and volume.

Result of the third example: 27.8% percent mass-volume concentration.

Recap of the three formulas for calculating percent concentrations.

Encouragement to subscribe and thanks for watching the educational video.

Transcripts

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Percent ConcentrationChemistry CalculationsMass ConcentrationVolume ConcentrationMass-Volume ConcentrationSolute CalculationSolution PreparationChemistry TutorialEducational VideoScience Education