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Precipitate

A precipitate is known as a _______________ What does a precipitate look like? Out of the 5 reactions we talked about, which ones deals with the formation of a precipitate? If you have a double replacement reaction and you know both reactants, can you predict the products?

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Precipitate

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  1. A precipitate is known as a _______________ • What does a precipitate look like? • Out of the 5 reactions we talked about, which ones deals with the formation of a precipitate? • If you have a double replacement reaction and you know both reactants, can you predict the products? • What do you have to check to see if a precipitate will form? Precipitate

  2. AQUEOUS - solid dissolved in water (think about reaction types) SOLUBLE – the substance that will dissolve in another substance Example: salt + water INSOLUBLE – the substance that will NOT dissolve in another substance Example: sand + water Terms

  3. SOLUTE – the substance being dissolved SOLVENT – the substance that dissolves the solute SOLUTION – a mixture of substances  Homogenous (looks the same) Terms

  4. Last part of Mole Island Molarity = moles of solute liters of solution M = moles L ***liters here is different than the 22.4 liters of gas @ STP ***to covert mL to L, divide mL by 1000 Molarity

  5. Molarity mol L M

  6. What is the volume of solution when 2.30 moles of potassium chromate are dissolved to produce a molarity of 0.89 M? 2.30 mols / 0.89 M = 2.6 L Examples

  7. How many moles of cobalt (II) acetate are contained in 50.0 mL of a 2.13 M solution? 50.0 mL / 1000 mL = 0.0500 L Mols = M x L = 2.13 M x 0.0500 L = 0.106 mols Examples

  8. Find the molarity for 734 g of lithium sulfate when dissolved to make 2500 mL of solution. 2500 mL / 1000 mL = 2.5 L 734 g x ( 1 mol Li2SO4 / 109.95 g Li2SO4) = 6.68 mols M = mols / L = 6.68 mols / 2.5 L = 2.7 M Examples

  9. True or false, in this lab a precipitate formed. How were you able to get the mass of just the precipitate (what procedure)? Many of you were getting high results for the mass of Cu. Why? Hint: Were you weighing only the Cu? (filter + Cu + H2O) How could we have weighed just the Cu + filter? Cu + Fe Lab

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