Does calcium oxide react with hydrochloric acid?

Select one of the presented hypotheses and then verify it.

The calcium oxide reacts with the hydrochloric acid.
The calcium oxide does not react with the hydrochloric acid.

• test tubes,

• a small reagent spoon,

• hydrochloric acid,

• calcium oxide,

• acid‑base indicator: methyl orange or red cabbage stock.

1. Pour 2–3 cmIndeks górny 3³ of a hydrochloric acid into a test tube.

2. Add a few drops of the methyl orange solution or the red cabbage stock.

3. Add, in small portions, the calcium oxide using the small reagent spoon.

4. Observe the changes that occur.

The calcium oxide underwent conversion with the hydrochloric acid. The following equation describes the transformation:

$\text{CaO}\text{ + 2HCl → Ca}{\text{Cl}}_{\text{2}}\text{ + }{\text{H}}_{\text{2}}\text{O}$

$\text{calcium oxide + hydrochloric acid → calcium chloride + water}$

The result of this reaction is salt and water.
Adding an excess of calcium oxide results in a change in the solution's reaction to basic (colour of the red cabbage stock – green) because the reaction product is calcium hydroxide:

$\text{CaO}\text{ + }{\text{H}}_{\text{2}}\text{O → Ca}{\text{(OH)}}_{\text{2}}$

$\text{calcium oxide + water → calcium hydroxide}$

Does magnesium oxide react with nitric acid?

Select one of the presented hypotheses and then verify it.

Magnesium oxide reacts with nitric acid.
Magnesium oxide does not react with nitric acid.

• test tubes,

• a small reagent spoon,

• nitric acid solution,

• magnesium oxide,

• acid‑base indicator: methyl orange or red cabbage stock.

1. Pour 2–3 cmIndeks górny 3³ of nitric acid solution into a test tube.

2. Add a few drops of the methyl orange solution or the red cabbage stock.

3. Add, in portions, magnesium oxide using the small reagent spoon.

4. Observe the changes that occur.

The magnesium oxide underwent conversion with the nitric acid. The following equation describes this transformation:

$\text{MgO}\text{ + 2H}{\text{NO}}_{\text{3}}\text{ → Mg}{{\text{(NO}}_{\text{3}}\text{)}}_{\text{2}}\text{ + }{\text{H}}_{\text{2}}\text{O}$

$\text{magnesium oxide + nitric acid → magnesium nitrate + water}$

The result of this reaction is salt and water.

Does the copper(II) oxide react with the sulfuric acid?

Select one of the presented hypotheses and then verify it.

The copper(II) oxide reacts with the sulfuric acid.
The copper(II) oxide does not react with the sulfuric acid.

• test tubes,

• a small reagent spoon,

• burner,

• sulfuric acid solution,

• copper(II) oxide.

1. Pour 2–3 cmIndeks górny 3³ of sulfuric acid solution into a test tube.

2. Add a small portion of the copper(II) oxide with a small reagent spoon.

3. Mix the contents of the tube and observe what happens with the sediment.

4. Heat the mixture gently in the burner's flame for a few minutes.

5. Observe the changes that occur.

Copper(II) oxide reacts with sulfuric acid in accordance with the following equation:

$\text{CuO}\text{ + }{{\text{H}}_{\text{2}}\text{SO}}_{\text{4}}\text{→ Cu}{\text{SO}}_{\text{4}}\text{ + }{\text{H}}_{\text{2}}\text{O}$

$\text{copper(II) oxide + sulfuric acid → copper(II) sulfate + water}$

Heating of the substrates speeds up this transformation.
This reaction produces salt and water.

Does the carbon dioxide react with the calcium hydroxide?

Select one of the presented hypotheses and then verify it.

The carbon dioxide reacts with the calcium hydroxide.
The carbon dioxide does not react with the calcium hydroxide.

• beaker,

• drinking straw or a glass tube,

• saturated calcium hydroxide solution (limewater).

1. Pour limewater into the beaker.

2. Introduce the air exhaled from the lungs into the limewater water through the straw (or a glass tube) until changes occur in the water.

The carbon dioxide reacts with the calcium hydroxide according to the following chemical equation:

${\text{CO}}_{\text{2}}\text{ +}{\text{Ca(OH)}}_{\text{2}}\text{→ Ca}{\text{CO}}_{\text{3}}\text{↓ + }{\text{H}}_{\text{2}}\text{O}$

$\text{carbon dioxide + calcium hydroxide → calcium carbonate + water}$

The result of this reaction is salt and water.