AQA A LEVEL CHEMISTRY REQUIRED
PRACTICAL 10 QUESTIONS WITH ANSWERS.
What,do,you,need,to,consider,when,choosing,a,solvent,?,,,ANS,-
It,will,dissolve,both,compound,+,impurities,at,high,temps
It,will,not,dissolve,compound,at,low,temp,(so,it,will,crystallise)
Why,is,the,minimum,volume,of,solvent,used,?,,,ANS,-To,make,a,saturated,solution
To,increase,the,yield,of,the,compound,(enable,crystallisation,on,cooling)
Why,do,you,hot,filter,the,solution,?,,,ANS,-Remove,insoluble,impurities,
Prevent,crystals,reforming
Why,do,you,need,to,cool,the,beaker,solution,in,ice,?,,,ANS,-Crystals,reform,(ice,increases,yield),
Soluble,impurities,in,solution
Why,use,suction,filtration,?,,,ANS,-The,water,pump,decreases,the,pressure,and,speeds,up,filtration
If,asked,to,draw,the,suction,filtration,what,should,you,draw,?,,,ANS,-Buchner,suction,funnel
One,armed,flask
Why,do,you,wash,the,crystals,with,distilled,water?,,,ANS,-To,remove,soluble,impurities
Why,might,the,yield,be,lower,?,,,ANS,-Crystals,lost,filtering,and,washing,
Product,remains,into,solution,after,crystallisation
side,reactions
PRACTICAL 10 QUESTIONS WITH ANSWERS.
What,do,you,need,to,consider,when,choosing,a,solvent,?,,,ANS,-
It,will,dissolve,both,compound,+,impurities,at,high,temps
It,will,not,dissolve,compound,at,low,temp,(so,it,will,crystallise)
Why,is,the,minimum,volume,of,solvent,used,?,,,ANS,-To,make,a,saturated,solution
To,increase,the,yield,of,the,compound,(enable,crystallisation,on,cooling)
Why,do,you,hot,filter,the,solution,?,,,ANS,-Remove,insoluble,impurities,
Prevent,crystals,reforming
Why,do,you,need,to,cool,the,beaker,solution,in,ice,?,,,ANS,-Crystals,reform,(ice,increases,yield),
Soluble,impurities,in,solution
Why,use,suction,filtration,?,,,ANS,-The,water,pump,decreases,the,pressure,and,speeds,up,filtration
If,asked,to,draw,the,suction,filtration,what,should,you,draw,?,,,ANS,-Buchner,suction,funnel
One,armed,flask
Why,do,you,wash,the,crystals,with,distilled,water?,,,ANS,-To,remove,soluble,impurities
Why,might,the,yield,be,lower,?,,,ANS,-Crystals,lost,filtering,and,washing,
Product,remains,into,solution,after,crystallisation
side,reactions
