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Physical Methods of Concentration

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Questions and Answers

What is the concentration of copper in ppb units in an alloy containing 5 g of an alloy with 10 mg of copper?

2000 ppb

1000 ppb

100 ppb

200 ppb (correct)

What is the unit of measurement represented by %w/w?

Grams of solute per 100 mL of solution

Milliliters of solute per 100 mL of solution

Grams of solute per 100 g of solution (correct)

Grams of solute per liter of solution

What is the concentration of a substance in a solution with 2 g of the substance in 100 mL of solution in %w/v units?

2 %w/v (correct)

20 %w/v

5 %w/v

10 %w/v

How many milligrams of a substance are required to prepare 500 mL of a solution with a concentration of 2000 ppb?

1000 mg Signup and view all the answers

What is the difference between physical and chemical methods of expressing concentration?

Physical method uses physical units, while chemical method uses chemical units. Signup and view all the answers

What is the concentration of a substance in a solution with 5 g of the substance in 100 g of solution in %w/w units?

5% Signup and view all the answers

What does the abbreviation 'ppb' represent?

Parts per billion Signup and view all the answers

What is the concentration of a substance in a solution with 10 mL of the substance in 100 mL of solution in %V/V units?

10% Signup and view all the answers

How many grams of a substance are required to prepare 100 mL of a solution with a concentration of 5 g/L?

0.5 g Signup and view all the answers

What is the main difference between physical and chemical methods of expressing concentration?

The units used to express the concentration Signup and view all the answers