Test For Ions

Question 1

Answer 1

Question 2

Answer 2

Question 3

Q5.In an experiment to determine its solubility in water, solid barium hydroxide was added to 100cm of water until there was an excess of the solid. The mixture was filtered and an excess of sulfuric acid was added to the filtrate. The barium sulfate produced was obtained from the reaction mixture, washed with cold water and dried. The mass of barium sulfate was then recorded.

(a) Explain why the mixture was filtered before the addition of sulfuric acid
(B) Explain why the barium sulfate was washed before it was dried

Answer 3

(a) Remove undissolved barium hydroxide / excess solid
(b) remove (excess) sulphuric acid

Question 4

Answer 4

Question 5

Answer 5

Question 6

(c)
Explain why different observations are made when aqueous barium chloride is added separately to aqueous magnesium sulfate and to aqueous magnesium nitrate.
Write the simplest ionic equation, including state symbols, for any reaction that occurs

Answer 6

BaSO4 is insoluble but Ba(NO3) is soluble
Ba2+ (aq) + SO4^2- (aq)—> BaSO4(s)

Question 7

Answer 7

Any soluble chloride including hydrochloric acid (ignore concentration)
M2 white precipitate or white solid / white suspension
M3 remains colourless or no reaction or no (observed) change or no precipitate or clear solution or it remains clear

Question 8

Answer 8

Question 9

Identify the two reagents that could be used in a test to confirm that the solutions contained chloride ions, not bromide ions. State what would be observed on addition of each reagent.

Answer 9