Question

In step 2 of the experimental procedure, you added 6 M sodium hydroxide to the copper(II) nitrate solut form copper(II) hydroxide. You added a minimum amount of sodium hydroxide, but enough to complete reaction. How do you determine that enough sodium hydroxide has been added

Answer 1

To determine if enough sodium hydroxide has been added, look for a color change in the solution indicating the formation of copper(II) hydroxide.

Step-by-step explanation:

When determining if enough sodium hydroxide has been added to complete the reaction in step 2, you need to observe a color change. In this case, copper(II) hydroxide is formed when sodium hydroxide is added to copper(II) nitrate. Copper(II) hydroxide is a blue solid, so when you see a blue color appear in the solution, that indicates that enough sodium hydroxide has been added to complete the reaction.

Answer 2

The solution becomes colorless and a light blue precipitate is formed.

Step-by-step explanation:

When sodium hydroxide is added to copper(II) nitrate solution, a precipitate of copper(II) hydroxide is formed.

The solution gradually becomes colorless as the light blue precipitate appears.

The reaction is complete (enough sodium hydroxide has been added) when the blue color of the solution completely disappears.

The equation of the reaction is;

Cu(NO3)2(aq) + 2NaOH(aq) → Cu(OH)2(s) + 2NaNO3(aq)