Solubility Calculations and Concepts

This video tutorial by Bright Edo on 'Chemistry Made Easy' focuses on solubility calculations, crucial for JAMB exams. It covers calculating solubility in moles per DM³ and grams per DM³, providing formulas and examples. The tutorial emphasizes understanding the role of volume units and the importance of not using temperature in solubility calculations.

What are the two SI units used to express solubility?

• Moles per liter and grams per liter

• Moles per dm³ and grams per dm³

• Moles per cm³ and grams per cm³

• Moles per m³ and grams per m³

Which formula should be used to calculate solubility in moles per dm³ when the volume is given in cm³?

• Mass times volume over molar mass

• Mass over molar mass times volume

• Mass times 1,000 over molar mass times volume

• Mass over volume

In the example of Na2CO3, why is temperature not considered in solubility calculations?

• Temperature is constant in all solubility problems

• Temperature affects only the rate of dissolution

• Temperature is irrelevant for solubility

• Temperature is only used for confusing students

What is the solubility in moles per dm³ of Na2CO3 when 60g is dissolved in 500 cm³ of water?

• 1.32 moles per dm³

• 0.60 moles per dm³

• 2.64 moles per dm³

• 1.00 moles per dm³

When calculating solubility in moles per dm³ for CuSO4, what is the molar mass used?

• 160 g/mol

• 64 g/mol

• 32 g/mol

• 128 g/mol

For a solution with volume in dm³, how is the solubility in moles per dm³ calculated?

• Mass times 1,000 over molar mass times volume

• Mass over molar mass times volume

• Mass over volume

• Mass times volume over molar mass

What is the key difference in the formula for calculating solubility in grams per dm³ compared to moles per dm³?

• Removal of volume

• Addition of temperature

• Removal of molar mass

• Addition of molar mass

In the example of N2SO4, what is the solubility in grams per dm³ when 40g is dissolved in 500 cm³ of water?

• 100 g per dm³

• 40 g per dm³

• 80 g per dm³

• 60 g per dm³

Why is 1,000 added to the formula when calculating solubility in grams per dm³ with volume in cm³?

• To adjust for temperature changes

• To convert mass from grams to kilograms

• To simplify the calculation

• To convert volume from cm³ to dm³

What should be done if the volume is given in dm³ when calculating solubility in grams per dm³?

• Add 1,000 to the formula

• Remove 1,000 from the formula

• Multiply by molar mass

• Divide by temperature