08 - Título em Massa, Porcentagem e Volume

Summary

In this video, João Castro from 'Química com Potássio' explores the concept of concentration in solutions, focusing on mass and volume percentages. The tutorial explains how to calculate the mass concentration (title) and how it relates to the mass of the solute and solvent. João also covers how to express concentration in terms of percentage and volume, using practical examples such as mixing salt and water, and calculating concentrations in solutions like vinegar. With easy-to-follow calculations and explanations, this video provides valuable insight into understanding and calculating solution concentration.

Takeaways

• 😀 The video explains the concept of concentration units, focusing on mass and volume titles in solutions.
• 😀 Mass title represents the percentage of solute or solvent in a solution, calculated by dividing the mass of the solute by the total mass.
• 😀 The mass of a solution is the sum of the solute and solvent masses, and the title can be expressed as a fraction or percentage.
• 😀 Solute title is the ratio of the solute mass to the total mass of the solution, while solvent title follows the same formula.
• 😀 To convert mass title to percentage, multiply the result by 100.
• 😀 Example 1: For a solution with 80g of solute and 120g of solvent, the solute title is 40%, and the solvent title is 60%.
• 😀 Example 2: For a solution with 20g of H2SO4 and 100g of water, the solute percentage is 16.6%, and the solvent percentage is 83.3%.
• 😀 Volume title works similarly to mass title but is used for liquid-liquid or gas-liquid solutions, focusing on the volume of solute and solvent.
• 😀 To calculate volume percentage, divide the volume of solute by the total volume of the solution, then multiply by 100.
• 😀 Example 3: For a vinegar solution with 55 mL of acetic acid in 1 liter of solution, the volume title is 5.5%.

Q & A

What is the definition of 'título' in the context of solutions?

In the context of solutions, 'título' refers to the concentration of a solute, expressed as the ratio of the solute mass (or volume) to the total mass (or volume) of the solution. It is often presented as a percentage, indicating the proportion of the solute in the solution.

How is the 'título' in mass calculated?

The 'título' in mass is calculated by dividing the mass of the solute by the total mass of the solution. The formula is: Título = (Mass of Solute / Total Mass of Solution). This value can be expressed as a percentage by multiplying the result by 100.

What is the difference between the 'título' of the solute and the 'título' of the solvent?

The 'título' of the solute represents the mass of the solute divided by the total mass of the solution, while the 'título' of the solvent represents the mass of the solvent divided by the total mass of the solution. The sum of the solute and solvent titles should equal 1 (or 100% when expressed as a percentage).

Can the 'título' be expressed as a percentage?

Yes, the 'título' can be expressed as a percentage. To do so, the result of the title calculation is multiplied by 100. This gives the concentration of the solute (or solvent) in the solution as a percentage.

What are the steps to calculate the 'título' of a solution given 80g of solute and 120g of solvent?

To calculate the 'título' of the solution, first, calculate the total mass of the solution (80g of solute + 120g of solvent = 200g). Then, divide the mass of the solute by the total mass of the solution. Título = (80g / 200g) = 0.4, or 40%. The title of the solvent would be (120g / 200g) = 0.6, or 60%.

What formula is used to calculate the 'título' in volume?

The formula for the 'título' in volume is: Título (volume) = (Volume of Solute / Total Volume of Solution). Similar to the mass-based título, it is also often expressed as a percentage by multiplying the result by 100.

How is the 'título' in volume calculated for a solution with 55mL of acetic acid in 1 liter of solution?

To calculate the 'título' in volume for this solution, divide the volume of the solute (55mL of acetic acid) by the total volume of the solution (1000mL). Título = (55mL / 1000mL) = 0.055, or 5.5%.

What does the phrase 'totalidade' refer to in the context of calculating 'título'?

In the context of calculating 'título,' 'totalidade' refers to the total mass or volume of the solution, which includes both the solute and the solvent.

How can the 'título' of the solvent be calculated once the 'título' of the solute is known?

The 'título' of the solvent can be calculated by subtracting the 'título' of the solute from 1 (or 100% if working with percentages). For example, if the solute title is 0.4, then the solvent title would be 1 - 0.4 = 0.6.

In which situations is the 'título' in volume typically used?

The 'título' in volume is typically used for solutions that are liquid-liquid mixtures or gas-liquid mixtures, where both solute and solvent are liquids or gases. It is commonly applied in situations like mixtures of liquids such as vinegar or alcoholic beverages.