This page reflects the procedure because that predicting whether mixing two aqueous systems of ionic compound will cause a precipitation reaction and shows you just how to compose complete and net ionic equations because that the reactions that take place.The following is a typical problem.

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Predict even if it is a precipitatewill form when water remedies of silver nitrate, AgNO3(aq), and also sodium sulfide, Na2S(aq), space mixed. If there is a precipitation reaction, write thecomplete and net ionic equation that defines the reaction.

Study Sheet

Tip-off – when you areasked come predict even if it is a precipitation reaction takes place when two aqueoussolutions the ionic compounds space mixed and to write complete and also net ionicequations because that the reaction, if that takes place.

General Steps

Step1:Determine the formulas for the possibleproducts utilizing the general twin displacement equation. (Remember to considerion charges when writing your formulas.)

AB + CD →AD + CB

Step2:Predict whether one of two people of the possibleproducts is water insoluble. If either possible product is insoluble, aprecipitation reaction takes place, and also you will proceed with action 3. Ifneither is insoluble, write “No reaction”.

Step3: follow these procedures to write the completeequation.

Write the formulas for the reaction separated by a “+”.

Separate the formulas for the reactants and also products through asingle arrow.

Write the formulas for the commodities separated through a “+”.

Write the physical state for each formula.

1) The insoluble product will certainly be adhered to by (s).

2) Water-soluble ionic compounds will be adhered to by(aq).

Balance the equation

Step 4:Follow these steps to compose the network ionic equation.

Write the finish ionic equation by describingwater-soluble ionic link as separate ions and also insoluble ioniccompounds through a finish formula.

Eliminate the formulas for the ions that space unchanged in thereaction (the spectator ions).

Rewrite what is left after ~ the spectator ions space removed.

Balance the equation.


EXAMPLE 1 – Predicting Precipitation Reactions: Predict even if it is a precipitatewill kind when water services of silver nitrate, AgNO3(aq), and sodium sulfide, Na2S(aq), are mixed. If there is a precipitation reaction, create thecomplete and also net ionic equation that explains the reaction.

Solution:

Step1:Determine the possible products making use of the general dual displacement equation.

AB + CD →AD + CB

In AgNO3, Ag+ is A, and NO3− is B. InNa2S, Na+ is C, and S2− is D. The feasible products indigenous the mixture ofAgNO3(aq) and Na2S(aq) are Ag2S and NaNO3. (Remember to think about charge when you recognize the recipe forthe feasible products.)

AgNO3(aq) + Na2S(aq) toAg2S and NaNO3

Step 2: guess whether either of the feasible products is water insoluble.

According come our solubility guidelines, many sulfides areinsoluble, and also compounds v Ag+ room not detailed as one exception. Therefore,Ag2S would certainly be insoluble. Becausecompounds include Na+ and also NO3− room soluble,NaNO3 is soluble.

Step 3: Writethe finish equation. (Don’t forget come balance the equation.)


2AgNO3(aq) + Na2S(aq) →Ag2S(s) + 2NaNO3(aq)

Step 4: compose the network ionic equation.

Write the finish ionic equation, explicate the aqueousionic compounds, AgNO3(aq), Na2S(aq) and also NaNO3(aq), together ions. Define the solidwith a finish formula.

2Ag+(aq) + 2NO3−(aq) +2Na+(aq)+ S2−(aq) →Ag2S(s) + 2Na+(aq) + 2NO3−(aq)

The nitrate and also sodium ions have actually the same type on every sideof the equation, for this reason they are got rid of as spectator ions.

2Ag+(aq) + S2−(aq) →Ag2S(s)


EXAMPLE 2 – Predicting Precipitation Reactions: Predict whether a precipitatewill form when water services of barium chloride, BaCl2(aq), and sodium sulfate, Na2SO4(aq), space mixed. If over there is a precipitation reaction, write thecomplete and net ionic equation that explains the reaction.


Solution:

Step1:Determine the feasible products utilizing the general double displacement equation.

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AB + CD → ad + CB

In BaCl2, A is Ba2+,and B is Cl−. In Na2SO4, C is Na+, and also D isSO42−. The feasible products indigenous reaction that BaCl2(aq) and Na2SO4(aq) areBaSO4 and also NaCl. (Remember toconsider charge as soon as you determine the formulas because that the feasible products.)

BaCl2(aq) + Na2SO4(aq) come BaSO4 and NaCl

Step 2: predict whether either of the feasible products is water insoluble.

According come oursolubility guidelines, many sulfates are soluble, but BaSO4 is one exception. Itis insoluble and also would precipitate from the mixture. Because compoundscontaining Na+ and also Cl− space soluble, NaCl is soluble.

Step 3: Writethe complete equation. (Don’t forget to balance the equation.)

BaCl2(aq) + Na2SO4(aq)

→ BaSO4(s) + 2NaCl(aq)

Step 4: write the finish ionic equation, explicate the aqueousionic compounds as ions. Define the solid as a finish formula.

Ba2+(aq) + 2Cl−(aq) +2Na+(aq)+ SO42−(aq) →BaSO4 (s) + 2Na+(aq) + 2Cl−(aq)

The chloride and sodium ions have the same type on each sideof the equation, so they are got rid of as spectator ions.

Ba2+(aq) + SO42−(aq)→BaSO4(s)

This is the reaction usedin industry to type barium sulfate, which is provided in repaint preparations and also in x-rayphotography.