How to solve percent concentration problems even if you're 🤷🏻‍♀️ - Dr K

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By the end of this video, you're going to feel confident when it comes to how to solve percent concentration problems. You'll figure out how to identify the percent concentration problems. You'll know that you don't need to memorize the formulas. And most importantly, you'll be able to solve percent concentration problems confidently. We will use 4 percent concentration problems, each of them covering percent by mass, percent by volume and percent mass and volume. We'll start easy and work our way up.
Here are the 4 percent concentration problems we'll work through in this video:
Problem 1:
If I make a solution by adding water to 75mL of ethanol until the total volume of the solution 375mL, what’s the percent by volume of ethanol in the solution?
Problem 2:
You have 200g of a solution that contains 30g of HCl. What percentage of your solution is made up of HCl?
Problem 3:
How would you prepare a 500mL of 30% vinegar in water solution?
Problem 4:
A saline solution, NaCl in water, is 10% (m/v). How many grams of NaCl are required to prepare 35.0mL of this solution?
🕑 Here's when you'll find:
0:00 Percent concentration problems
0:44 Percent by mass
1:54 Percent by volume problem 1
2:30 Percent by volume problem 2
4:12 Percent by mass and volume
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Опубликовано:

28 июл 2024

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Комментарии : 38

@jamalbartholomewiii7133 Год назад

Thank goodness, I finally get the concept our chem teacher said to us.

@ChemSimplified Год назад

That's awesome! Congrats on your understanding! 🎉

@muhammada.muhammad6287 8 месяцев назад

good job

@midnightshatinggabi 10 месяцев назад

life could've been so easy like this but my teacher likes it so complicated im gonna cry out for this

@ChemSimplified 9 месяцев назад

You're fine now that you've found simpler explanation. 😊

@ayissa48 10 месяцев назад

Thank you so very much!!!!

@ChemSimplified 9 месяцев назад

You're absolutely welcome!

@stellamendoza4587 10 месяцев назад

Thank you!!!!! This made sense it was short nd cut to the chase!😊

@ChemSimplified 9 месяцев назад

Thanks! Could you do me a favor and help share it with your friends who need this? It'll mean a lot. 😊

@nokia_eq23 8 месяцев назад

Is it the same if you're using a stock solution? Bc in my book it sys that 6ml of stock solution (glucose) in 4ml of water has a concentration % of 12

@aegonplayz7356 Год назад

I finally got it TYSM

@ChemSimplified Год назад

Congrats!!!

@baraa3822 2 года назад

Thank you greatly for these easy, straightforward videos. By any chance do you have any videos relating to molar concentration not percentage? Or is it the same process but without the percentage?

@ChemSimplified 2 года назад

Glad you find the videos helps. I do have quite a few videos on molar concentration. I refer to them as molarity. Here are a few to get you started: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vWIIIHzZ5o4.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6sZG078Yk8k.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_6-zKPWYxPg.html Do you need dilution videos?

@ChemSimplified 2 года назад

Molar concentration and percentage are similar in that their numerator is solute and the denominator is solution. However for molar concentration the top part is mols and the bottom part is L, and it does not have multiply 100. For that rrason, I'd say it's rather different than the percent concentrations. Hope the videos above will give you a good start on molar concentrations!

@baraa3822 2 года назад

@@ChemSimplified thank u so much ur amazing

@ChemSimplified 2 года назад

You're most welcome! I'm happy to be able to help. All the best in your Chemistry. You got it! 💪🏼😊

@rbd6661 Год назад

you failed to demonstrate the numerator version of an equation. call conversions was done with denominators.

@BreadPitt24 3 года назад

Danke ^-^

@ChemSimplified 3 года назад

du bist sehr willkommen

@omaryousef7806 Месяц назад

thank you so much

@ChemSimplified 22 дня назад

You're most welcome.

@rickycrumel 22 дня назад

Nice video but the words are too small. Thank you.

@ChemSimplified 22 дня назад

Thanks for the feedback.

@ArpitDixit-ez3bk 2 месяца назад

God great thanks

@ChemSimplified 2 месяца назад

Glad you find the video helpful. Thanks for leaving a comment!

@ArpitDixit-ez3bk 2 месяца назад

@@ChemSimplified thanks can you upload more on formulas and numerical of chemistry please it's a request

@nurmuhammad4540 Год назад

so for the last question, the amount of solvent is 350-3.5=346.5 ml or 353.5 total volume?

@ChemSimplified Год назад

For that question, you can't figure out the volume of solvent. This is because the information we obtained for the solute (NaCl) is mass (in grams), and you can't subtract mass from volume.

@nurmuhammad4540 Год назад

@@ChemSimplified Then, to make a 10 wt% (NaCl) 35 ml solution, I need to add 3.5 g solute to the 35 ml solvent, right? and in this case, water is the solvent. isn't 1ml water = 1 g?

@ChemSimplified Год назад

@@nurmuhammad4540 Hi Nur, if it's 10% (m/v), then the way you will prepare it is to measure out 3.5g of solute. Then, you'll add sufficient solvent so that the overall solution reaches 35mL. Since the solute takes up volume, the volume of solvent is definitely less than 35mL.

@nurmuhammad4540 Год назад

@@ChemSimplified Thank you so much.

@ChemSimplified Год назад

@@nurmuhammad4540 No problem! Glad I could help.

@elvi3372 Год назад

Is %(m/m)the same as %(w/w)

@ChemSimplified Год назад

Yes

@adnanheiza442 16 дней назад

How to prepare 50wt% of A with B?

@ChemSimplified 7 дней назад

If you look at the formula for %wt, it's mass of solute/mass of solution x 100%. In this case, assuming you're preparing a total of 100g solution, how much A will you need? And how much B would that be?