Concentration percentage

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Presentation transcript:

Concentration percentage

There are 237 g of sugar in 2 L of pepsi There are 237 g of sugar in 2 L of pepsi. Express this as a ppm concentration.

Warmup Question The concentration of salt in ocean water is approximately 35 g/L. Vishal wants to build a swimming pool to rival Tiffany’s. It will have 20 kL of salted water to simulate the ocean. How much salt will Vishal have to put in his pool?

Ppm Review The lethal dose of arsenic in drinking water is 0.01 ppm. If you have 3 L of water, what is the maximum amount of arsenic than can be present?

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One more way to calculate concentration… We can also write concentration as a percentage

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Percentage Concentration This method of expressing concentration shows the portion of solute per total solution as a percentage.

m/m% example Ashley collects 0.3 kg of snow from her driveway and lets it melt. She finds 13 g of road salt left over. What is the m/m% concentration of salt?

Chocolate contains a compound called theobromine Chocolate contains a compound called theobromine. You would need to eat approximately 10 000 g of chocolate (250 chocolate bars at once) for this compound to kill you. A standard 40 g bar contains 1.17 mg of theobromine. What is its m/m% concentration?

v/v% Sometimes, you will have two volumes to work with. The procedure is the same.

Justin adds 50 mL of milk to 0. 4 L of cake batter Justin adds 50 mL of milk to 0.4 L of cake batter. What is its v/v% concentration?

Can you do m/v%?

Can you do m/v%? Yes you can… what is the density of water?

m/v% concentration So… yes you can… but your mass must be in g and your volume must be in mL.

You put 27 g of sugar into 1 L of water. What is its m/v% concentration?

m/v% The m/v% concentration of a solution is 22%. How much solute is present in 16 L of this solution?

How to convert from g/L to ppm to m/v%...