Solution chemistry What are solutions?

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SOLUTIONS Concentration Measurement: Molarity

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Presentation transcript:

Solution chemistry What are solutions? 1. a mixture of 2 or more substances 2. that is uniform throughout (homogeneous) Individual parts can’t be seen Examples: gas in gas gas in liquids liquids in liquids solid in liquid solid in solid

Terms: Solvent the substance that dissolves something else (like water) Solute the substance that dissolves (like salts)

3. Molarity (M) Expresses how many moles of solute is dissolved in 1.00 liters of solution Ex: The solution is .25 M HCl. This means that there are .25 moles of solute in 1.00 liters of solution This is the way in which we will express concentration.

How would you make a .250 M NaCl solution? 1.Mass out .25 moles NaCl… Note: .25 moles 58.43g/1 mole NaCl (Mass out 14.6 g of NaCl) 2. Add water until you have reached the mark on the volumetric flask.

The Math The equation 1. How many grams of NaOH are there in 400. ml of a 0.40 M solution?

How many moles of HCl are there in 10.0 ml of a 6.0 M solution? Describe how to make 200. ml of a 0.50 M solution of NaOH