Concentrations in Percent

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Presentation transcript:

Concentrations in Percent

What is percentage? “per 100”

Percentage Grey squares = 20 Total squares = 100 Percentage = 20% What percentage of the squares are grey?

Percent (m/V) We can also measure concentration in % (m/V)

What is the % concentration? m= 2g V = 25ml C= 𝑚 𝑉 = 2𝑔 25𝑚𝑙 2𝑔 25𝑚𝑙 = 𝑥𝑔 100𝑚𝑙 2𝑔 25𝑚𝑙 = 8𝑔 100𝑚𝑙 1 ml of water (solvent) 1 g of solute 8%

Which drink has the highest concentration of sugar? Situation Which drink has the highest concentration of sugar?

11.83% Practice Problem C=? m= 42g V = 355ml 1. What is the % concentration of sugar in a 355ml can of Coca-Cola? C=? m= 42g V = 355ml C= 𝑚 𝑉 = 42𝑔 355𝑚𝑙 42𝑔 355𝑚𝑙 = 𝑥𝑔 100𝑚𝑙 11.83%

5.92% Practice Problem C=? m= 35g V = 591ml 35𝑔 591𝑚𝑙 = 𝑥𝑔 100𝑚𝑙 2. What is the % concentration of sugar in a 591ml bottle of Gatorade? C=? m= 35g V = 591ml C= 𝑚 𝑉 = 35𝑔 591𝑚𝑙 35𝑔 591𝑚𝑙 = 𝑥𝑔 100𝑚𝑙 5.92%

Practice V= 𝑚 𝐶 V= 24𝑔 8𝑔/100𝑚𝑙 = 24𝑔 𝑥 100𝑚𝑙 8𝑔 V=300ml C= 8% m= 24g 3. What is the maximum volume that Will can make of an 8% solution of chocolate milk if he uses 24g of Nesquik powder? V= 𝑚 𝐶 C= 8% m= 24g V = ? V= 24𝑔 8𝑔/100𝑚𝑙 = 24𝑔 𝑥 100𝑚𝑙 8𝑔 V=300ml

Practice Workbook: p.34-35