Cation Precipitation Test - Statistics

General Stats

Answer Stats

Hint	Answer	% Correct
Step 1	Add HCl	100%
Which ions precipitate?	Ag⁺ and Pb²⁺	71%
Ag⁺ + Cl⁻ → AgCl(s) what is the ppt colour?	white	71%
Pb²⁺ + 2Cl⁻ → PbCl₂(s) what is the ppt colour?	white	71%
Step 2	Add H₂SO₄	57%
To distinguish between Ca²⁺ and Ba²⁺	Add NaF to previous solution	57%
Step 3	Add NaOH	57%
Precipitate dissolves	Ag⁺	57%
Ion does not precipitate	Ba²⁺	57%
Which ions precipitate?	Ba²⁺ and Ca²⁺	57%
Which ions precipitate?	Mg	57%
Precipitate does not dissolve	Pb²⁺	57%
Ba²⁺ + SO₄²⁻ → BaSO₄(s) what is the ppt colour?	white	57%
Ca²⁺ + SO₄²⁻ → CaSO₄(s) what is the ppt colour?	white	57%
Ca²⁺ + 2F⁻ → CaF₂(s) what is the ppt colour?	white	57%
To distinguish between Pb and Ag	Add NH₃ to ppt	43%
Cu²⁺ + 2OH⁻ → Cu(OH)₂(s) what is the ppt colour?	blue	43%
Fe³⁺ + 3OH⁻ → Mg(OH)₃(s) what is the ppt colour?	brown	43%
Fe²⁺ + 2OH⁻ → Fe(OH)₂(s) what is the ppt colour?	green	43%
Mg²⁺ + 2OH⁻ → Mg(OH)₂(s) what is the ppt colour?	white	43%
	Cu	29%
	Fe(II)	29%
	Fe(III)	29%

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