Calculating the Number of Moles in a Solution

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Presentation transcript:

Calculating the Number of Moles in a Solution Learning Objectives: To be able to calculate the number of moles of a solute in a solution, given the concentration of the solution and the volume of the solution.

Calculating Amounts You use this triangle in the same way as you did before, to calculate the number of moles of a substance that you have. Cover over the one you want to know and then the calculation you need will be left. number of moles concentration volume (in dm3)

Great! You wanted to find the number of moles, so... Example If you want to know the number of moles of a solute in a solution... number of moles concentration volume (in dm3) Reset Click on the variable you want to find out in the triangle Great! You wanted to find the number of moles, so... number of moles = concentration x volume (in dm3) No of moles This would give Volume (dm3) = Concentration No of moles This would give Concentration = Volume (dm3)

This would give Volume (dm3) = Concentration No of moles Example If you want to know the number of moles of a solute where there are 500 cm3 of a 2.0 mol.dm-3 solution... number of moles concentration volume (in dm3) Reset No of moles This would give Volume (dm3) = Concentration Is that what you needed to find out? No of moles This would give Concentration = Volume (dm3) Is that what you needed to find out? Great! You wanted to find the number of moles, so... number of moles = concentration x volume (in dm3) moles = 2 x 0.5 dm3 (500 ÷ 1000) = 1.0 mol

A 0.5 mol.dm-3 solution has a volume of 0.2 dm3. Questions A 0.5 mol.dm-3 solution has a volume of 0.2 dm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.5 x 0.2 = 0.1 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.2 mol.dm-3 solution has a volume of 200 cm3. Questions A 0.2 mol.dm-3 solution has a volume of 200 cm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.2 x 0.2 = 0.04 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.15 mol.dm-3 solution has a volume of 0.02 dm3. Questions A 0.15 mol.dm-3 solution has a volume of 0.02 dm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.15 x 0.02 = 0.003 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 1.0 mol.dm-3 solution has a volume of 0.2 dm3. Questions A 1.0 mol.dm-3 solution has a volume of 0.2 dm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 1.0 x 0. 2 = 0.2 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.25 mol.dm-3 solution has a volume of 10 cm3. Questions A 0.25 mol.dm-3 solution has a volume of 10 cm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.25 x 0.01 = 0.0025 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.01 mol.dm-3 solution has a volume of 25 cm3. Questions A 0.01 mol.dm-3 solution has a volume of 25 cm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.01 x 0.025 = 0.00025 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.075 mol.dm-3 solution has a volume of 0.2 dm3. Questions A 0.075 mol.dm-3 solution has a volume of 0.2 dm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.075 x 0. 2 = 0.015 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.1 mol.dm-3 solution has a volume of 2.5 dm3. Questions A 0.1 mol.dm-3 solution has a volume of 2.5 dm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.1 x 2.5 = 0.25 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.1 mol.dm-3 solution has a volume of 250 cm3. Questions A 0.1 mol.dm-3 solution has a volume of 250 cm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.1 x 0.25 = 0.025 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.

A 0.5 mol.dm-3 solution has a volume of 0.02 dm3. Questions A 0.5 mol.dm-3 solution has a volume of 0.02 dm3. How many moles of solute are in the solution? Answer moles Check moles = Concentration x volume = 0.5 x 0.02 = 0.01 moles Pupils do questions and then put answer in box and check. There are 10 questions. A score could be given at the end. Is there a way of randomly generating values for concentration and volume; that would be even better.