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Molarity & Dilution

Molarity & Dilution. By: Wes Corkum. Molarity. concentration is the measure of how much solute is dissolved in a given amount of solution. The main measure of concentration in chemistry is molarity, written as M. Molarity is given by the number of moles of solute per 1 litre of solution.

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Molarity & Dilution

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  1. Molarity&Dilution By: Wes Corkum

  2. Molarity • concentration is the measure of how much solute is dissolved in a given amount of solution. • The main measure of concentration in chemistry is molarity, written as M. • Molarity is given by the number of moles of solute per 1 litre of solution. • The units are always Moles/Litres

  3. Ionization • When a molecule dissociates into its atoms, we can find the molarity of the atoms. • This is done by using the mole ratios. • For example, if we had BaCl2 with a molarity of 1, when it ionized we would have 1 mol/L of Ba and 2 mol/L of Cl

  4. Example • BaCl2 -> Ba+ + 2Cl- • for every 1 mol of BaCl2 there is 1 mol of Ba and 2 mol of Cl.

  5. Dilution • Diluting a solution means adding volume without adding solute • most chemicals used in labs have been diluted from their original molarity. • After a substance has been diluted, we have a formula to find its new molarity.

  6. M1V1=M2V2 • This equation can be used to find molarity or volume, before or after a dilution has occurred. • It says that the molarity multiplied by the volume before the dilution is equal to the molarity multiplied by the volume after the dilution.

  7. Example • 10ml of 12 molar hydrochloric acid is added to 200ml of water. • Find the molarity of the new solution.

  8. First you should realise that you have been given the molarity and volume before, and can find the volume afterward by adding the volume of the water and the acid. • Next, convert your volume into litres. • Your equation should look like this. • (12)(0.01) = (M)(0.21) • now all you need to do to find your molarity is divide by 0.21, and you get an answer of 0.57 mol/L

  9. Bibliography • Chem 12 blue booklet • www.wikipedia.com

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