A solution of silver nitrate is mixed with a solution of potassium sulphide.Write the molecular,total ionic,and net ionic equations illustrating the reaction.
To write the molecular, total ionic, and net ionic equations for the reaction between silver nitrate and potassium sulfide, we need to know the formulas of the compounds and the solubility rules.
The formula for silver nitrate is AgNO3, and the formula for potassium sulfide is K2S.
Step 1: Write the molecular equation
By simply combining the formulas of the reactants, we get the balanced molecular equation:
AgNO3 + K2S → Ag2S + KNO3
Step 2: Write the total ionic equation
To write the total ionic equation, we need to dissociate all the soluble ionic compounds into their respective ions. Silver nitrate (AgNO3) dissociates into silver ions (Ag+) and nitrate ions (NO3-), while potassium sulfide (K2S) dissociates into potassium ions (K+) and sulfide ions (S2-). However, we need to consider the solubility rules to determine if any of these compounds are insoluble and remain in their molecular form. According to the solubility rules, sulfides are typically insoluble except when paired with Group 1 metals.
Since Ag2S is insoluble, it will remain as an undissociated compound in the ionic equation. The dissolution of silver nitrate and potassium sulfide is as follows:
AgNO3(aq) + K2S(aq) → Ag2S(s) + 2KNO3(aq)
Step 3: Write the net ionic equation
The net ionic equation is obtained by eliminating the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the reaction. In this case, the spectator ions are potassium (K+) and nitrate (NO3-). The net ionic equation is:
Ag+ + S2- → Ag2S(s)
That's it! The molecular equation is AgNO3 + K2S → Ag2S + KNO3, the total ionic equation is AgNO3(aq) + K2S(aq) → Ag2S(s) + 2KNO3(aq), and the net ionic equation is Ag+ + S2- → Ag2S(s).