WAEC - Chemistry (2021 - No. 8)
Which of the following pairs of compounds would form a precipitate when their aqueous solutions are mixed?
NaCl and KNO\(_{3}\)
KCL and NaNO\(_{3}\)
K\(_{2}\)SO\(_{4}\) and BaCl\(_{2}\)
NH\(_{4}\)NO\(_{3}\) and CO\(_{3}\)
คำอธิบาย
when potassium sulfate is mixed with barium chloride a white precipitate of barium sulfate will be form. barium sulfate is slightly soluble in water, so it will precipitate out as a solid
BaCl2 + K2SO4 → BaSO4 + 2KCl
note; all substances are aqueous except BaSO4 which is solid