Answer:
Step-by-step explanation:
The net ionic equation is essentially the most simplified version of a reaction with only the reactants that form the precipitate (the solid). Due to this it is extremely important to properly write your ionic equation first. In your total ionic equation, you forgot to balance the compounds with 2- charges. The coefficients in your equation is due to the 2- charge of sulfate and 2+ charge of Strontium. Additionally, precipitates are solid which means they do not dissociate. SrSO4 will stay together while KBR which are both spectator ions will dissociate leaving you with the ionic equation below.
Total Ionic Equation: Sr^2 (aq)+ + 2Br ^1- (aq) +2K ^ 1(aq) + SO4 ^2- (aq) --> SrSO4 (s) + 2K^1+ (aq) + 2Br^1- (aq)
The coefficient of 2 on both K and Br in the products is to ensure that the equation is balanced and that for your net ionic equation, all spectator ions cancel. When you cancel all of the ions that dissociate you are left with the essence of the reaction:
Net Ionic Equation: Sr^2 (aq) + SO4 ^2- (aq) --> SrSO4 (s)