Part c A student is tasked with determining the carbonate compound with a mass o
ID: 990204 • Letter: P
Question
Part c A student is tasked with determining the carbonate compound with a mass of 1.89 g. The compound is firs, placed in water, where it completely. The K_p values for several carbonate-containing compounds are given below. In order to precipitate the maximum amount of the carbonate ions Irom solution, which ot the following should be added to the carbonate solution: LiNO_3, NK(NO_3), or Sr(NO_3)_2? Justify your answer. The student should use the strontium nitrate. Using it would crcatc strontium carbonate, which has the lowest K_sp value. That means it is the least soluble carbonate compound of the three and will precipitate the most possible carbonate ions out of solution. For the carbonate compound that contains the cation chosen in part (a), determine the concentration of each ion of that compound in solution at equilibrium. When mixing the solution, should the student ensure the carbonate solution or the nitrate is in excess? Justify your answer.Explanation / Answer
The ntirate solution should be in excess.
In order to create the maximum amount of precipitate, enough strontium ions need to be added to react with all of the carbonate ions originally in solution. Having excess strontium ions in solution after the precipitate forms will not affect the calculated mass of the carbonate in the original sample.