Identifying Ions

Question 1

What is the test for sodium (Na⁺) ions?

Answer 1

Na⁺ ions can be tested for using a flame test. The flame will turn yellow if present.

Question 2

What is the test for lithium (Li⁺) ions?

Answer 2

Li⁺ ions can be tested for using a flame test. The flame will turn bright red if present.

Question 3

What is the test for calcium (Ca²⁺) ions?

Answer 3

Ca²⁺ ions can be tested for using a flame test. The flame with turn brick red if present.

Question 4

What is the test for barium (Ba²⁺) ions?

Answer 4

Ba²⁺ ions can be tested for using a flame test. The flame will turn green if present.

Question 5

What is the test for potassium (K⁺) ions?

Answer 5

K⁺ ions can be tested for using a flame test. The flame will turn lilac if present.

Question 6

What is the test for copper (Cu²⁺) ions?

Answer 6

Cu²⁺ ions can be tested for by adding sodium hydroxide to the copper solution. A blue precipitate will form if present.

Question 7

What is the test for iron (Fe²⁺) ions?

Answer 7

Fe²⁺ ions can be tested for by adding sodium hydroxide to the iron solution. A green precipitate that slowly turns brown will form if present.

Question 8

What is the test for iron (Fe³⁺) ions?

Answer 8

Fe³⁺ ions can be tested for by adding sodium hydroxide to the iron solution. A reddish-brown precipitate will form if present.

Question 9

What is the test for aluminium (Al²⁺) ions?

Answer 9

Al²⁺ ions can be tested for by adding sodium hydroxide to the aluminium solution. After a white precipitate forms, add more sodium hydroxide. The precipitate will dissolve if present.

Question 10

What is the test for calcium (Ca²⁺) ions or magnesium (Mg²⁺) ions?

Answer 10

Ca²⁺ ions or Mg²⁺ can be tested for by adding sodium hydroxide to the iron solution. After a white precipitate forms, add more sodium hydroxide. The precipitate will not dissolve if present.

Question 11

What is the test for carbonate (CO₃²⁻) ions?

Answer 11

CO₃²⁻ ions can be tested for by adding dilute hydrochloric acid. If it fizzes, add lime water. The lime water will turn milky if present.

Question 12

What is the test for sulfate (SO₄³⁻) ions?

Answer 12

SO₄³⁻ ions can be tested by adding dilute hydrochloric acid. If there is no fizz, add beryllium chloride (BeCl₂). A white precipitate will form if present.

Question 13

What is the test for chloride (Cl⁻) ions?

Answer 13

Cl⁻ ions can be tested for by adding silver nitrate (AgNO₃) and dilute nitric acid (HNO₃). A white precipitate should form if present.

Question 14

What is the test for bromide (Br⁻) ions?

Answer 14

Br⁻ ions can be tested for by adding silver nitrate (AgNO₃) and dilute nitric acid (HNO₃). A creamy precipitate should form if present.

Question 15

What is the test for iodide (I⁻) ions

Answer 15

I⁻ ions can be tested for by adding silver nitrate (AgNO₃) and dilute nitric acid (HNO₃). A yellow precipitate should form if present.