Testing for POSITIVE IONS

Question 1

In a flame test, what colour flame do lithium ions produce?

Answer 1

Crimson

Question 2

In a flame test, what colour flame do sodium ions produce?

Answer 2

Yellow

Question 3

In a flame test, what colour flame do potassium ions produce?

Answer 3

Lilac

Question 4

In a flame test, what colour flame do calcium ions produce?

Answer 4

Brick-red

Question 5

In a flame test, what colour flame do barium ions produce?

Answer 5

Apple-green

Question 6

In a flame test, what colour flame do copper ions produce?

Answer 6

Blue-green

Question 7

What is the effect of adding sodium hydroxide to copper (Cu2+) ions?

Answer 7

A blue precipitate is formed

Question 8

What is the effect of adding sodium hydroxide to iron (Fe2+) ions?

Answer 8

A dark green precipitate is formed

Question 9

What is the effect of adding sodium hydroxide to iron (Fe3+) ions?

Answer 9

A rust-brown precipitate is formed

Question 10

What is the effect of adding sodium hydroxide to calcium(Ca2+) ions, magnesium (Mg2+) ions, zinc (Zn2+) ions and aluminium (Al3+) ions?

Answer 10

A cloudy white precipitate is formed