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Published byDarcy McDowell Modified over 9 years ago
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A student put 25.0 cm 3 of Na(OH) solution with an unknown concentration into a conical flask using a pipette. The sodium hydroxide reacted with exactly 20.0 cm 3 of 0.50 mol/dm 3 HCl added from a burette. What was the concentration of the sodium hydroxide? 1)Moles of HCl added 0.50 x (20.0/1000) =0.010 moles of HCl 2) Moles of Na(OH) 0.010 moles 3) Concentration of Na(OH) 25 cm 3 = 0.025 dm 3 0.010/0.025 = 0.40 moles/dm 3
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Solubility curves L.O.: Explain how solubility changes with temperature and pressure. Predict what will happen when we cool a saturated solution.
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What is there in our water? Water contains calcium and magnesium salts.
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What type of compounds dissolved in water? Ionic compounds dissolved in water. What about gases?
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Solubility: amount of solute in grams that can be dissolved in 100 grams of solvent.
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The solubility of most solid solutes increases as the temperature rises
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Saturated solution A solution in which no more solute will dissolve
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Task: 1)Workbook pages 117-118 2)Extension: workbook 115-116
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