Chemistry

Find the solubility of KNO₃ at 20°C when the mass of the empty dish is 50 g. The mass of dish and solution is 65 g, while the mass of dish and residue is 54.3 g.

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Given,
Mass of empty dish (M) = 50 g
Mass of dish and solution (M₁ ) = 65 g
Mass of dish and residue (M₂ ) = 54.3 g

Mass of saturated solution = M₁ - M = 65 - 50 = 15 g
Mass of solute = M₂ - M = 54.3 - 50 = 4.3 g

Mass of solvent = mass of saturated solution - mass of solute
              = (M₁ - M) - (M₂ - M)
              = 15 - 4.3
              = 10.7 g

Solubility = $\dfrac{\text{Mass of solute}}{\text{Mass of solvent}}$ x 100

= $\dfrac{4.3}{10.7}$ x 100

= 40.18 g

∴ Solubility of KNO₃ at 20°C is 40.18 g.

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