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You should be able to calculate % composition of solutions

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Presentation on theme: "You should be able to calculate % composition of solutions"— Presentation transcript:

1 You should be able to calculate % composition of solutions
Mass Percent & Postlab You should be able to calculate % composition of solutions

2 % composition % by mass = mass of solute mass of solution
% by volume = volume of solute volume of solution

3 Find mass of solute (smaller):
Find mass of solvent + solute: Divide, make into % (x100): What is the percent by mass of NaHCO3 in a solution containing 20.0 g of NaHCO3 dissolved in g of water?

4 Change % to decimal: Plug & chug:
% by volume = volume of solute volume of solution If you have 115 mL of 23% ethanol-water solution, what volume of ethanol is present?

5 Solubility of KNO3 Postlab

6 Convert data into g/100 mL 2.0 g = x g 5.0 mL 100.0 mL
Make large solubility curve  Solubility of sodium nitrite in water

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