Neutralisation of Alkalis

This video tutorial covers the concept of neutralization reactions, focusing on the chemistry of alkalis. It explains the difference between alkalis and bases, the dissociation of ions in solutions, and how neutralization affects pH levels. The tutorial also demonstrates how to use titration to determine the molarity of a solution and discusses practical applications of neutralization in industrial settings, such as treating alkaline wastewater.

What is the main difference between an alkali and a base?

• Alkalis have a pH below 7.

• All alkalis are bases.

• All bases are alkalis.

• Bases are ionic compounds.

Which ions are involved in the neutralization process?

• Ca2+ and SO4-

• H+ and OH-

• Na+ and Cl-

• K+ and NO3-

What happens to the pH of a solution as the concentration of OH- ions increases?

• The pH becomes neutral.

• The pH remains the same.

• The pH decreases.

• The pH increases.

In a titration, what is the relationship between the molarity and volume of the acid and base at the point of neutralization?

• Molarity of acid equals molarity of base.

• Volume of acid equals volume of base.

• Molarity of acid plus molarity of base equals total volume.

• Molarity of acid times volume of acid equals molarity of base times volume of base.

What is the molarity of the sodium hydroxide solution in the given challenge problem?

• 0.1937 molar

• 0.2000 molar

• 0.2500 molar

• 0.2156 molar

Why is it important for factories to neutralize their alkaline waste?

• To prevent environmental harm and legal issues.

• To increase the pH of local rivers.

• To make the waste more acidic.

• To enhance the color of dyes.

What pH range is typical for the alkaline waste produced by factories that make clothes dyes?

• 3 to 5

• 6 to 8

• 10 to 12

• 13 to 14