Question

in double displacement or precipitate reaction how do we come to know that which cumpound will form precipitate ? ​

Answer 1

well actually there is no formula or trick that you can know which reaction going to form precipitate

but , in double displacement reaction

it is common to form percipitate

so whenever you see there is double displacement reaction , this can be leads to percipitate formation

otherwise, you will have to learn all precipitation reaction

Answer 2

Answer:

Precipitates. When two aqueous solutions react, they sometimes form solids in the solution. The solid is called a precipitate. ... A double-replacement reaction is when the ions in two compounds exchange places with each other in an aqueous solution.

Explanation:

• When two aqueous solutions react, they sometimes form solids in the solution. The solid is called a precipitate. Precipitation reactions occur when the cations of one reactant and the anions of a second reactant found in aqueous solutions combine to form an insoluble ionic solid that we call a precipitate.
• Most precipitates are formed in a double-replacement reaction. A double-replacement reaction is when the ions in two compounds exchange places with each other in an aqueous solution. AX + BY --> AY + BX, where A, B, X and Y are all ions.

• An ionic solution is when the ions of a compound have dissociated in an aqueous solution. A reaction happens when you mix two aqueous solutions. This is when you find out if a precipitate will form or not. A precipitate forms if the product of the reaction of the ions is insoluble in water.

• Solubility rules for inorganic compounds will help predict whether something will come out of a solution to form a precipitate. There are many different tables in books and on the Internet explaining solubility rules. The problem with making succinct rules is that there are so many exceptions to any rule.

• Common sodium, potassium and ammonium compounds are soluble in water.
• Common nitrates, acetates and chlorates are soluble.
• Common chlorides are soluble except for silver, mercury and lead.
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