If the solubility of KNO3 3 at 300 0 C is 3.10 mol/dm3 3 a solution containing 303g/dm3 3 KNO3 3 is likely to be

Assessment: JAMB UTME - Chemistry - 2024 Subject: Chemistry

Question 1 Report

If the solubility of KNO3 3  at 300 0 C is 3.10 mol/dm3 3  a solution containing 303g/dm3 3  KNO3 3  is likely to be
Answer Details

To determine the condition of the solution containing KNO3 at 300C, let's start by calculating the molarity of the given solution.


The molecular weight of KNO3 (Potassium Nitrate) is approximately:

  • K = 39 g/mol
  • N = 14 g/mol
  • O = 16 g/mol

Thus, KNO3 = 39 + 14 + (16 * 3) = 101 g/mol.


Now, to determine the molarity of the given solution:

  • 303 g/dm3 of KNO3
  • Moles of KNO3 = 303 g / 101 g/mol = 3 mol/dm3

Compare with the solubility at 300C:

  • The solubility of KNO3 at 300C is given as 3.10 mol/dm3
  • The calculated molarity of the given solution is 3 mol/dm3.

If we compare the values:

  • The solution's molarity (3 mol/dm3) is less than the solubility limit (3.10 mol/dm3)

Hence, the solution is unsaturated because it can still dissolve more KNO3 until it reaches the solubility limit of 3.10 mol/dm3.

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