recrystalisation

Question 1

hot an What is this?

Answer 1

= purify solids
= the solvent chosen is significant

Question 2

What is the first step?

Answer 2

= minnimum volune/add just enough hot solvent to allow impure solid to dissolve this means you have a saturated solution of your impure product
= hot filter the solution through fulter paper quickly- remove insoliable impurities heat will prevent crystals from remforming during filtration

Question 3

What is step 2?

Answer 3

= allow the solution to cool down slowly crystals will form
= insrting beaker into ice
= impurities will remain dissolved, in solution as smaller quantity, it takes longer to crystalis

Question 4

What is step 3 ?

Answer 4

suction filtrate with a buchner flask and funnel to seperate crystals

Question 5

What is step 4?

Answer 5

= wash crystals with dsitilled water t reove soluable impurities
= dry the crystals between asorobet paper

Question 6

Importance of the solvent?

Answer 6

= impure solvent to dissolve fully in hot solvent but insoluable when its cold
= if not..
= substance wotn dissolve in hit solvent and you cant filter the purified solid if it is soluable in cold solvent
=

Question 7

How can we detect impurities?

Answer 7

= measuring boiling points
= using distillation
= gently heat sample so we can see what temperature it dilutes and using the therometer,
= compare agaisnt values
= contains impurities if boiling point is higher than what is recorded in data book
= sample boils over a rane of temperature

Question 8

Whay mayloose some yield?

Answer 8

= crystals lost when filterig or washing
= sme pridycts stay in soltion
= other side reactions happening