Question

Which rule describes why AgCl is a precipitate?

Group of answer choices

Compounds containing the chloride ion (Cl−), bromide ion (Br−), and iodide ion (I−) -- Exceptions are those of silver (Ag+), mercury(I) (Hg22+), and lead(II) (Pb2+)

Compounds containing the sulfate ion (SO42−) -- Exceptions are those of silver (Ag+), calcium (Ca2+), strontium (Sr2+), barium (Ba2+), mercury(I) (Hg22+), and lead(II) (Pb2+)

Compounds containing the alkali metal ions (Li+, Na+, K+, Rb+, Cs+) and ammonium ion (NH4+)

Compounds containing the nitrate ion (NO3−), acetate ion (CH3COO−), chlorate ion (ClO3−), and bicarbonate ion (HCO3

Answer 1

The rule that describes why AgCl is a precipitate is: "Compounds containing the chloride ion (Cl−), bromide ion (Br−), and iodide ion (I−) -- Exceptions are those of silver (Ag+), mercury(I) (Hg22+), and lead(II) (Pb2+)." This means that when a compound containing chloride ion is mixed with a compound containing Ag+, Hg22+ or Pb2+, a precipitate (solid) of AgCl is formed.