Strong and Weak Alkali's

The video tutorial explains the differences between strong and weak alkalis, building on previous lessons about acids. It describes how alkalis dissociate in water, affecting their strength and pH levels. Strong alkalis like sodium hydroxide dissociate almost completely, resulting in a high concentration of hydroxide ions and a high pH. Weak alkalis, such as ammonium hydroxide, dissociate less, leading to a lower concentration of hydroxide ions and a pH closer to neutral. The video also covers how to identify alkalis using indicators and provides examples of both strong and weak alkalis.

What is the main characteristic that differentiates a strong acid from a weak acid?

• The color change in litmus paper

• The extent of dissociation in water

• The presence of a conjugate base

• The ability to conduct electricity

Which of the following is a property of an alkali?

• It has a pH less than 7

• It turns blue litmus paper red

• It turns red litmus paper blue

• It is insoluble in water

How can you determine if an alkali is strong or weak without using a universal indicator?

• By checking its density

• By measuring its temperature

• By considering its dissociation in water

• By observing its color

What happens to sodium hydroxide when it is dissolved in water?

• It partially dissociates into ions

• It forms a precipitate

• It completely dissociates into Na+ and OH- ions

• It remains undissolved

Which of the following is an example of a weak alkali?

• Sodium hydroxide

• Calcium hydroxide

• Ammonium hydroxide

• Potassium hydroxide