Safety and Properties of Sulfuric Acid

The video explains the reaction between sulfuric acid (H2SO4) and water (H2O). Initially, H2SO4 dissociates completely in water, forming HSO4- and H+. This is a strong acid reaction. The second reaction involves HSO4- further dissociating into SO4-- and H+, but this is a weak acid reaction, reaching equilibrium. The video also discusses the formation of the hydronium ion (H3O+) and the exothermic nature of the reaction, emphasizing safety precautions due to the potential for burns and boiling.

What makes sulfuric acid (H2SO4) a strong acid?

• It has a low pH value.

• It is a weak electrolyte.

• It dissociates completely in water.

• It has a high boiling point.

What ions are formed when sulfuric acid first dissociates in water?

• H2O and H+

• SO4-- and H+

• HSO4- and H+

• H3O+ and SO4--

What is the charge of the sulfate ion (SO4) after the second dissociation reaction?

• Neutral

• Positive

• Negative

• Double negative

What does the equilibrium in the second dissociation reaction of HSO4- indicate?

• All HSO4- ions convert to SO4--

• No HSO4- ions convert to SO4--

• Some HSO4- ions remain undissociated

• HSO4- ions form a solid precipitate

What ion is formed when H+ combines with water?

• Bicarbonate ion (HCO3-)

• Sulfate ion (SO4--)

• Hydronium ion (H3O+)

• Hydroxide ion (OH-)

Why is the hydronium ion (H3O+) important in solutions?

• It decreases the acidity.

• It is a measure of acidity.

• It forms a solid precipitate.

• It increases the boiling point.

What is a potential hazard of adding concentrated sulfuric acid to water?

• It forms a harmless gas.

• It can cause the water to boil and splash.

• It causes the water to freeze.

• It cools down rapidly.

What safety precaution should be taken when mixing sulfuric acid with water?

• Use cold water to mix.

• Add water to acid slowly.

• Add acid to water slowly.

• Mix them in a closed container.

What happens if you add too much concentrated sulfuric acid to water at once?

• It can cause steam and splashing.

• It becomes very cold.

• It forms a solid precipitate.

• It remains unchanged.

What is the result of the exothermic reaction between sulfuric acid and water?

• The solution becomes acidic.

• The solution cools down.

• The solution becomes neutral.

• The solution becomes hot.