Question

Reaction of insoluble oxide with a strong acid. Give a molecular equation for it.​

Answer 1

Answer:

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Explanation:

Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.Compounds having anions such as sulfide (S2−), hydroxide (OH−), carbonate (CO32−), and phosphate (PO43−) are often insoluble in water. A precipitate will form if a solution containing one of these anions is added to a solution containing a metal cation such as Fe2+, Cu2+, or Al3+.

Fe2+(aq) + 2 OH−(aq) → Fe(OH)2(s)

Al3+(aq) + PO43−(aq) → AlPO4(s)

Minerals are water-insoluble compounds. Precipitation reactions in nature can account for mineral formation in many cases, such as with undersea vents called “black smokers” that form metal sulfides.

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