practicals

Question 1

making standard solution
(magnesium nitrate)

Answer 1

calculate mass of Mg(NO3)2
weigh mass of crystals (2+ dp balance)
dissolve in deionised water
transfer to 250cm3 volumetric flask
rinse beaker and transfer washings to flask
fill up so meniscus is on the mark using dropping pipette
stopper and invert to mix

Question 2

halogen and halide

Answer 2

mix solution of halogen and solution of halide
chlorine : bromide -> orange yellow
bromide : iodide-> violet
iodine: no reaction
Cl2 + 2Br- —> Br2 + 2Cl-
reactivity decreases down group

Question 3

purification organic liquid

Answer 3

separating funnel to remove organic layer from aqueous layer
top layer is organic
anhydrous MgSO4 to dry organic layer
distill to purify product
collect fraction at (named bp mentioned in q)