Copper Ion Reactions Quiz

What is observed when copper two-plus ions react with sodium hydroxide?

• A green gas is released

• A light blue precipitate forms

• No reaction occurs

• A dark blue solution forms

What happens when excess sodium hydroxide is added to the copper two-plus ions?

• The solution turns green

• The precipitate remains insoluble

• A red precipitate forms

• The precipitate dissolves

How does the reaction of copper two-plus ions with ammonia change with excess ammonia?

• The precipitate dissolves into a dark blue solution

• The precipitate remains unchanged

• The solution turns red

• A yellow gas is released

What is the initial observation when copper two-plus ions react with a small amount of ammonia?

• No visible change occurs

• A yellow precipitate forms

• A light blue precipitate forms

• A dark blue solution forms

What is the role of hydroxide ions in the reaction with copper two-plus ions?

• They form a gas

• They react to form copper hydroxide

• They dissolve the precipitate

• They have no effect