Determine whether the combination of each pair of solutions can or cannot be tested in the precipitated interactive.

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Step 1 of 2

Given different pairs of solutions which can be tested in the precipitation interactive.

To determine the combinations which can be tested in interactive and which can not.


These interactive tests are based on the reactions of different compounds.

Step 2 of 2

Ba(NO3)2 and KI

K2S and Ni(NO3)2

Above these can be tested in the interactive, these can form precipitate (ppt), so it can be tested in interactive.

KI and K2SO4

Pb(NO3)2 and KOH

Ba(NO3)2 and Pb(NO3)2

K2CO3 and KI

Above these cannot be tested in the interactive. There is no formation of precipitate (ppt), therefore it cannot be tested in interactive. When certain cations and anions interact in an aqueous solution, precipitates are insoluble ionic solid products of the process. The variables that affect how a precipitate forms can be different. Certain reactions, like those involving buffer solutions, are temperature-dependent, whereas others just depend on the concentration of the solution. The following is an illustration of a precipitation reaction: One of the products is solid, and both reactants are watery. The reactants dissociate and are soluble since they are ionic and watery.

  1. Ba(NO3)2+KI=BaI2+KNO3

(both are soluble product hence can be tested.)

Solubility: BaI2​ is insoluble.

  1. K2S+Ni(NO3)2=KNO3+NiS

(KNO3 in aqueous solution and NiS in solid form)

Solubility: NiS is insoluble.

  1. KI+K2SO4=No Reaction

(same cation present)

  1. Pb(NO3)2+KOH=Pb(OH)2+KNO3

(both the products formed are soluble in water hence, not precipitated)

Solubility: Pb(OH)2​ is insoluble.

  1. Ba(NO3)2+Pb(NO3)2=No reaction

(Same anion present)

Hence, no precipitation, both salts are soluble

  1. K2CO3+KI=No reaction

(Same cation present)

Hence, no precipitation, carbonate is soluble.


To determine whether a precipitation reaction will occur when solutions of two ionic compounds are mixed, we need to consider the solubility rules.

The solubility of each compound is indicated in parentheses.

Final solution

Below are the combinations which can be tested in the interactive

Ba(NO3)2 and KI

K2S and Ni(NO3)2

And below are the combinations which can not be tested in the interactive

KI and K2SO4

Pb(NO3)2 and KOH

Ba(NO3)2 and Pb(NO3)2

K2CO3 and KI


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