Concentration in mol/dm3 Flashcards

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What does concentration in mol/dm3 tell you about a solution?

It tells you how many moles of solute are dissolved in each cubic decimetre (dm3) of solution.

What units are used for concentration in moles?

mol/dm3, which means moles per cubic decimetre.

What is the formula linking concentration (c), amount in moles (n), and volume (V in dm3)?

c = n ÷ V.

How do you work out the number of moles in a solution if you know its concentration and volume?

Use n = c × V, with volume V in dm3.

How do you work out the volume in dm3 if you know the moles and the concentration?

Use V = n ÷ c.

How many cubic centimetres (cm3) are there in 1 dm3?

There are 1000 cm3 in 1 dm3.

How do you change a volume from cm3 to dm3 for concentration calculations?

Divide the volume in cm3 by 1000.

A solution has 0.25 mol of sodium chloride in 0.50 dm3 of solution. What is its concentration in mol/dm3?

c = 0.25 ÷ 0.50 = 0.50 mol/dm3.

A solution has a concentration of 2.0 mol/dm3 and a volume of 0.20 dm3. How many moles of solute does it contain?

n = 2.0 × 0.20 = 0.40 mol.

Why do chemists often use concentration in mol/dm3 instead of g/dm3?

Because it shows how many moles of particles are present and links to the reacting ratios in equations.