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Analyzing Blue Vitriol Discussion

Analyzing Blue Vitriol Discussion. Fill in the blanks on your handout!. Did you synthesize the Blue Vitriol?. Maybe? Maybe not? If you got the original bright blue color of your original sample of blue vitriol then you were on the right track!. What is Blue Vitriol used for?.

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Analyzing Blue Vitriol Discussion

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  1. Analyzing Blue Vitriol Discussion Fill in the blanks on your handout!

  2. Did you synthesize the Blue Vitriol? • Maybe? Maybe not? • If you got the original bright blue color of your original sample of blue vitriol then you were on the right track!

  3. What is Blue Vitriol used for? • Control mold & fungus • Control algal growth in water • Dye fixative • Fertilizer • Blue/green flame for fireworks

  4. Remember: Inputs and Outputs • Inputs: substances added to a system, a reactant • Outputs: substances that are produced from a system, products

  5. Was heating blue vitriol an example of a chemical reaction or a physical change? • Both • 1st it was physical change • B/c it changed texture (from blue crystallight blue powder) only changed physical form • 2nd it was chemical reaction • B/c as it was heated longer, color of powder changed from light bluewhite/gray; COLOR CHANGE = CHEMICAL REACTION!

  6. Other evidence for a chemicalreaction • When you synthesize BV by adding water you get a NEW color • Clear water + gray/white powderdark blue solution! • When you add water to solid gray/white powder, heat is released • Water + solidheat released! • Exothermic reaction!

  7. Blue Vitriol aka Copper Sulfate pentahydrate • CuSO4•5H2O • Naturally occurring hydrate • Hydrate: material or compound that has a specific number of water molecules attached to it • Water can be removed from material by heating it • When water is removed the material is anhydrous • Heat CuSO4•5H2O and you get anhydrous CuSO4

  8. Blue vitriol contin’d • Anhydrous materials: do not contain water, BUT CAN absorb water from their surroundings • Ex: desiccants (drying agents) • Ex: “do not eat” packets - made of silica gel • Ex: dehumidifying agents in sachets - keep things dry • Hygroscopic: = “water seeking” Takes up and holds onto water

  9. Blue Vitriol contin’d • Hygroscopic materials: absorb water, usually water from atmosphere, • A hygroscopic material is a hydrate! The water can USUALLY be removed from the material by heating. • Ex CaCl2, MgSO4, Na2SO4 • This is an example of REVERSIBLE chemical reaction • MOST chem. Changes are nonreversible. • Absorbing/removing water is a reversible chemical reaction that can go back and forth!

  10. Hygroscopic example • BaCl2 +2H2O  BaCl2 •2H2O

  11. Blue Vitriol contin’d • Anhydrides: materials that react with water and the reaction is IRREVERSIBLE! • Anhydrides react w/ water and form NEW COMPOUNDS (acids & bases) • Ex: BaO + H2O --> Ba(OH)2

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