RPs

• time taken for a fixed amount of substance to form?

  Disappearing cross - add acid with container with cross- add other reactant start timing. repeat with differing temps or temp stated. record time for cross to disappear. keep other variables but time constant.
• time taken for a fixed amount of substance to form? - graph?


  plot rate - 1/T (y-axis) by Temperature (x-axis). should see when an increase in temp an increase in rate
• aqueous solution with known mas?

  weigh boat, weight boat an mass then transfer solid to beaker. weight boat after then measure by difference. dissolve substance in water. transfer to 250cm3 volumetric flask. shake and invert multiply times.
• electrode potential?


  weigh 7.9g of solid- dissolve in acid- transfer to volumetric flask make up to mark. piece of metal immersed in solution. connect with salt bridge. connect with volmeter. record voltage/ emf. EMF = RHS- LHS
• tlc?


  pencil base line, add amino acid drops, plate below solvent- base line above the solvent line- leave solvent on top of plate. remove mark solvent + dry
• recrystallisation?


  dissolve compound in minimum volume of hot solvent, cool down the solution in an ice bath. add funnel in a Buchner flask to filter and separate dry crystals. wash crystals wit distilled water to remove soluble impurities. dry solution in a fume cupboard.