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5 (a)
Dip nichrome wire/silica rod into concentrated hydrochloric acid and then
into the solid [1]
Heat in a blue Bunsen flame [1]
Orange/yellow flame indicates the presence of sodium [1]
[3]
(b)
Add dilute hydrochloric acid to the solid [1]
Bubble the gas given off through limewater [1]
If the limewater turns milky/cloudy then carbonate/hydrogencarbonate
ions are present [1]
[3]
(c)
Make a solution of the solid [1]
Add a solution of magnesium ions [1]
A white precipitate indicates a carbonate, no precipitate indicates a
hydrogencarbonate [1]
[3]
9
Section B Total
36
Paper Total
90