Solubility - BWA L3 - Thwaites J - PDF

Expectations - Respect - School Rules - When anyone is - 1 warning before a talking, everybody debit/sending out else should be - Cold calling listening - LESSON ready - This app...

Expectations - Respect - School Rules - When anyone is - 1 warning before a talking, everybody debit/sending out else should be - Cold calling listening - LESSON ready - This applies to - 3 = attention both your teacher - 2 = no talking and other - 1 = pens and students equipment down  Lesson Title: Solubility Date: Wednesday, 13th December Starter (5 minutes) What is it called when two or What is a substance called more substances mix in a that is dissolved by another homogenous (uniform) way? substance? A solution A solute Give two examples of a solvent and two examples of a What is the substance called solute that dissolves another substance? Solvent: Water, Ethanol, Acetone A solvent Extension: What are 3 ways we canSolute: Salt, Sugar, tell if something Carbon is a solution? dioxide  Saturation Do you think a solvent with be able to dissolve a continuous amount of solute? Once the solvent (such as water) cannot dissolve anymore solute (such as salt), the solution has become saturated Saturated A solution with the maximum mass of solute dissolved into the solvent. solution  Solubility So far we have talked about solute dissolving in solvent, but what determines how easily this dissolution can happen? Solubility is how easy it is for a solute to dissolve Sugar can dissolve: it is soluble Sand can’t dissolve: it is insoluble  Solubility and Saturation At room temperature you can dissolve about 200g of sugar in 100g of water Past this mass of sugar, it will not dissolve and will therefore sit in the solution unchanged Practical Temperature (oC) Mass of sodium chloride added (g) 20 40 60 80 100  Practical ▪ Today's practical will involve dissolving salt into water at different temperatures ▪ Method: ▪ 1) measure out 100ml of water ▪ 2) measure its temperature ▪ 3) in steps of a few grams (2-5), add the salt to the water ▪ 4) see how much you can add before it will no longer dissolve (Have someone keep a record on how much has already been added) ▪ 5) record the water temperature and how much it dissolved in a table ▪ 6) repeat steps 1 through 5 with different temperatures of water  What can change solubility? Try and think of anything that could affect the solubility of a solute (remember, the greater the mass dissolved, the more soluble) 1.The type of solute used can change solubility 2.The type of solvent used can change solubility 3.The temperature of the solvent can change solubility  Solubility What substance is the most soluble? What is the solvent in this experiment? What is the name for something that does not dissolve? What would happen if we put 40g of sodium chloride in 100g water?  Activity: Complete your keyword table adding this missing key word next to the definition. Normally water or alcohol which dissolves a solute The mixture of a solute and a solvent Any physical material A substance added to a solvent (e.g. salt or sugar) A substance that can not dissolve Describes a substance that can dissolve The process of a solute mixing and disappearing in a solvent How easy it is for something to dissolve  Activity: Complete your keyword table adding this missing key word next to the Solvent definition. Normally water or alcohol which dissolves a solute Solution The mixture of a solute and a solvent Substance Any physical material Solute A substance added to a solvent (e.g. salt or sugar) Insoluble A substance that can not dissolve Soluble Describes a substance that can dissolve Dissolve The process of a solute mixing and disappearing in a solvent Solubility How easy it is for something to dissolve A solute is something that dissolves. A solvent is something that dissolves a solute. A saturated solution is a solution with the maximum mass of solute dissolved Solubility into theeasy is how solvent. it is for a solute to dissolve. All solutes have different solubilities. As temperature increases the solubility of a substance generally increases. Sugar is more soluble than salt (sodium chloride).  Lesson objectives - Solubility Recall the words to do with solubility Describe a saturated solution Explain how solubility changes with temperature Know how to do a practical to measure how solubility changes with temperature