Calcium Hydroxide Solubility Concepts

The video tutorial covers the solubility of calcium hydroxide, starting with writing a balanced chemical equation for its dissolution in water. It then explains how to calculate the molar solubility of calcium hydroxide in a solution containing calcium nitrate. The concept of the solubility product is introduced, and simplifying assumptions are used to make calculations more manageable. Finally, the tutorial demonstrates how to draw a particle representation of water molecules around calcium ions.

What is the charge of calcium ions when calcium hydroxide dissolves in water?

• +1

• -2

• +2

• -1

In a solution with calcium nitrate, what is the initial concentration of calcium ions before adding calcium hydroxide?

• 0.20 M

• 0.15 M

• 0.10 M

• 0.05 M

What is the solubility product a measure of?

• The product of the concentrations of dissolved ions

• The rate of dissolution

• The concentration of reactants

• The concentration of products

Why is the concentration of solid calcium hydroxide not included in the solubility product expression?

• It is constant

• It is unknown

• It is negligible

• It is variable

What simplifying assumption is made when calculating the solubility of calcium hydroxide in a solution with calcium nitrate?

• The concentration of calcium ions is zero

• X is much larger than 0.10 M

• The concentration of hydroxide ions is zero

• X is much smaller than 0.10 M

What is the calculated molar solubility of calcium hydroxide in the presence of calcium nitrate?

• 1.8 M

• 0.0018 M

• 0.018 M

• 0.18 M

How many water molecules are oriented around a calcium ion in the particle representation diagram?

• Four

• Five

• Two

• Three

What is the orientation of water molecules around a calcium ion?

• Parallel to calcium

• Random orientation

• Oxygen atom towards calcium

• Hydrogen atoms towards calcium

What charge does the oxygen end of a water molecule have?

• Variable

• Neutral

• Negative

• Positive

What is the role of lone pairs of electrons in the orientation of water molecules around ions?

• They repel the ions

• They attract the ions

• They have no effect

• They neutralize the ions