Zinc 2+ Ion Test Quiz

What is the initial observation when zinc 2+ ions react with sodium hydroxide?

• No reaction occurs.

• A blue precipitate is produced.

• A white precipitate is produced.

• A colorless solution forms immediately.

How can you differentiate between zinc 2+ and calcium 2+ ions using sodium hydroxide?

• Zinc 2+ forms a blue precipitate.

• Calcium 2+ forms a colorless solution in excess sodium hydroxide.

• Zinc 2+ precipitate dissolves in excess sodium hydroxide.

• Calcium 2+ precipitate dissolves in excess sodium hydroxide.

What happens when excess ammonia is added to zinc 2+ ions?

• The solution turns blue.

• The white precipitate dissolves to form a colorless solution.

• The white precipitate remains unchanged.

• A red precipitate forms.

What is the common product formed when zinc 2+ ions react with both sodium hydroxide and ammonia?

• Zinc chloride

• Zinc sulfate

• Zinc hydroxide

• Zinc nitrate

Why is it important to distinguish between zinc 2+ and calcium 2+ ions in these tests?

• They both form white precipitates initially.

• They form different gases.

• They have different colors in solution.

• They react with different acids.