Calculating Concentrations

Which is the correct equation to calculate the mass of solute.

• mass = concentration x 1000

• mass = volume / concentration

• mass = concentration / volume

• mass = concentration x volume

28g of CaCl was dissolved in 0.4 dm³ of water.

Calculate the concentration of the solution with the correct units.

• 70 g

• 70 g/cm³

• 70 g/dm³

• 70 dm³

Explain the term 'concentration of a solution'

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NGSS.HS-PS1-5

A student is preparing two solutions, A and B to use in an experiment.

To make solution A he dissolved 40.0g of a substance in 500 cm³ of a solvent.

Calculate the concentration of solution A.

• 0.08 g/dm³

• 8 g/dm³

• 0.8 g/dm³

• 80 g/dm³

A student is preparing two solutions, A and B to use in an experiment.

Solution B needs to have a concentration of 60.0 g/dm³. What mass of the substance will the student need to dissolve in 500 cm³ to make solution B?

• 30 g

• 30 kg

• 30,000 g

• 60 kg

In an experiment a student finds the concentration of a solution.

He repeats the experiment for times and the results of these repeats are 18.2 g/dm³, 18.1g/dm³, 18.4 g/dm³ and 18.5 g/dm³.

Calculate the mean concentration of solution C in g/dm³.

The concentration of a solution is defined as how much ________ is dissolved in a particular volume of solvent.

Fill in the blank

1 dm³ is equal to which.

• 100 cm³

• 1 L

• 1000 g

• 10 cm³

Scientists use what to make up solutions of a particular concentration.

• Concentration Flask

• Aqueous Flask

• Volumetric Flask

• Deionised Flask

How do you decrease the concentration of a solution. Choose 2 options

• add more solvent

• add more solute

• remove solute

• add more water