Question

Which ions remain in solution, unreacted, after each of the following pairs of solutions is mixed? iron(ii) nitrate and rubidium sulfide. Express your answer as an ion. If there is more than one answer, separate each by using a comma.

Answer 1

When iron(II) nitrate and rubidium sulfide are mixed, the ions that remain in solution unreacted are NO3- and Rb+.

Step-by-step explanation:

When iron(II) nitrate and rubidium sulfide are mixed, the ions that remain in solution are the ones that are not involved in a chemical reaction. Iron(II) nitrate is composed of Fe2+ and NO3- ions, while rubidium sulfide is composed of Rb+ and S2- ions.

The chemical reaction between Fe2+ and S2- will result in the formation of iron(II) sulfide (FeS), which is insoluble and will precipitate out of the solution as a solid. Therefore, Fe2+ ions will no longer be in solution after the reaction. The remaining ions, NO3- and Rb+, will remain in solution unreacted.