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If 25cm\(^3\) of a saturated solution contains 0.02 moles of the solute, determine the solubility...

Chemistry
WAEC 2025

If 25cm\(^3\) of a saturated solution contains 0.02 moles of the solute, determine the solubility of the solute.

  • A. 5.0 X 10\(^{-4}\) mol dm\(^{-3}\)
  • B. 0.8 mol dm\(^{-3}\)
  • C. 0.4 mol dm\(^{-3}\)
  • D. 5.0 X 10\(^{-2}\) mol dm\(^{-3}\)
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Correct Answer: Option B
Explanation

Solubility in this context refers to the molar concentration of the saturated solution.

Given: 

Volume of Solution = 25 cm\(^3\)

Number of moles of solute, n = 0.02 mole

Solubility = ?

Solubility = \(\frac{n X 1000}{Volume of solvent}\)

               = \(\frac{0.02 X 1000}{25}\) = 0.8 moldm\(^{-3}\)


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