Chemical Changes RQP- obtaining a pure, dry sample of soluble salt from an insoluble oxide or carbonate

Question 1

what do you need to do in a question before you start the method?

Answer 1

identify the acid and the base- you can then write it into the method in the appropriate places

Question 2

step 1

Answer 2

add 25cm3 of the acid into a beaker and warm to 60 degrees

Question 3

step 2

Answer 3

then add 1 spatula of the base at a time, stirring in between until it is in excess (some uinreacted powder is left at the bottom)

Question 4

step 3

Answer 4

filter the mixture to remove the excess powder and collect the filtrate

Question 5

step 4

Answer 5

pour the filtrate into an evaporating basin and then evaporate it over a water bath until about 1/2 half of the solution has evaporated

Question 6

step 5

Answer 6

leave in a warm, dry place for the rest to evaporate naturally and for crystallisation to occur

Question 7

step 6

Answer 7

pat dry with filter paper