Cation Precipitation Test - Statistics

General Stats

Answer Stats

Hint	Answer	% Correct
Step 1	Add HCl	100%
Which ions precipitate?	Ag⁺ and Pb²⁺	83%
Ag⁺ + Cl⁻ → AgCl(s) what is the ppt colour?	white	83%
Pb²⁺ + 2Cl⁻ → PbCl₂(s) what is the ppt colour?	white	83%
Step 2	Add H₂SO₄	67%
To distinguish between Ca²⁺ and Ba²⁺	Add NaF to previous solution	67%
Step 3	Add NaOH	67%
Precipitate dissolves	Ag⁺	67%
Ion does not precipitate	Ba²⁺	67%
Which ions precipitate?	Ba²⁺ and Ca²⁺	67%
Which ions precipitate?	Mg	67%
Precipitate does not dissolve	Pb²⁺	67%
Ba²⁺ + SO₄²⁻ → BaSO₄(s) what is the ppt colour?	white	67%
Ca²⁺ + SO₄²⁻ → CaSO₄(s) what is the ppt colour?	white	67%
Ca²⁺ + 2F⁻ → CaF₂(s) what is the ppt colour?	white	67%
To distinguish between Pb and Ag	Add NH₃ to ppt	50%
Cu²⁺ + 2OH⁻ → Cu(OH)₂(s) what is the ppt colour?	blue	50%
Fe³⁺ + 3OH⁻ → Mg(OH)₃(s) what is the ppt colour?	brown	50%
Fe²⁺ + 2OH⁻ → Fe(OH)₂(s) what is the ppt colour?	green	50%
Mg²⁺ + 2OH⁻ → Mg(OH)₂(s) what is the ppt colour?	white	50%
	Cu	33%
	Fe(II)	33%
	Fe(III)	33%

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