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Solutions (1.5)

Solutions (1.5). Year 11 DP Chemistry Rob Slider. Solute : the substance that dissolves in another substance (solvent) to create a solution. Solvent : the substance (usually a liquid) that dissolves another substance (solute) to form a solution.

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Solutions (1.5)

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  1. Solutions (1.5) Year 11 DP Chemistry Rob Slider

  2. Solute: the substance that dissolves in another substance (solvent) to create a solution Solvent: the substance (usually a liquid) that dissolves another substance (solute) to form a solution Solution: the homogeneous mixture of one or more solutes in a solvent. Definitions

  3. Concentration: the amount of solute per volume of solution. Expressed as: g.dm-3 mol.dm-3 (M) If I have 25g of a substance in 500mL of solution, what is the concentration? Answer: 50 g.dm-3 Concentration What if I have 58.5 g of NaCl in 500mL? What is the concentration in mol.dm-3 or M? 2M

  4. C1 V1 = C2 V2 When diluting a solution, we change the concentration and the volume, but the number of moles of the solute (n) does not change (i.e. n = cv) Example: How much 10M HCl do we need to make up 1L of 2.5M HCl? Dilutions Notice that the # of moles (n) stays the same Answer: C1=10M, C2= 2.5M, V2=1000mL (10M)(V1) = (2.5M)(1000mL) V1 = 250mL

  5. How would you prepare 1dm3 of 2M NaCl? • Which is greater? • 1M hydrogen gas • 2 g.dm-3 hydrogen gas • I have a litre of 5M H2SO4 and I want to make up some 2M H2SO4. Explain how can this be done? Exercises

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