Changing One Component Quick Check

Use the equation showing the dissociation of iron thiocyanate in water to answer the question. FeSCN2+(aq) ⇄ Fe3+(aq) + SCN-(aq) In solution, FeSCN2+ ions are red, Fe3+ ions are pale yellow, and SCN- ions are colorless. Given that iron ions bind with hydroxide ions to produce solid Fe(OH)3, which statement about the solution is correct?

Decreasing the pH will release Fe3+ ions and cause the solution to become more red.

Use the reaction to answer the question. 3MnO42-(aq) + 4H+(aq) ⇄ 2MnO4-(aq) + 2H2O(l) + MnO2(s) In this reaction, MnO42- ions are green and MnO4- ions are purple. Which substance, when added to the solution, would make the solution more purple?

MnO42- ions

Which statement best explains what would happen if a reactant were added to a system in equilibrium?

The system would shift toward the products to enhance the change.

Use the equation showing the dissociation of iron thiocyanate in water to answer the question. FeSCN2+(aq) ⇄ Fe3+(aq) + SCN-(aq) In solution, FeSCN2+ ions are red, Fe3+ ions are pale yellow, and SCN- ions are colorless. When a solution at equilibrium is orange, which change would cause the solution to become pale yellow?

adding an ion that causes SCN- to precipitate

Use the reaction to answer the question. Cr2O72-(aq) + H2O(l) ⇄ 2CrO42-(aq)+ 2H+(aq) Given Cr2O72- ions are orange and CrO42- ions are yellow, which change to the reaction would most effectively make the solution more orange?

decreasing the pH