Solubility Chemistry Example 3

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Example 3

medium
At 25°C25°\text{C}, the solubility of CaSO4\text{CaSO}_4 is 0.21 g/100 mL0.21\,\text{g/100 mL}. If a student adds 1.01.0 g of CaSO4\text{CaSO}_4 to 200200 mL of water, will it all dissolve? How much remains undissolved?

Solution

  1. 1
    Maximum that dissolves in 200200 mL = 200100×0.21=0.42 g\frac{200}{100} \times 0.21 = 0.42\,\text{g}.
  2. 2
    Student added 1.01.0 g, but only 0.420.42 g can dissolve. Undissolved = 1.0−0.42=0.58 g1.0 - 0.42 = 0.58\,\text{g}.

Answer

0.58 g remains undissolved0.58\,\text{g remains undissolved}
Slightly soluble salts like calcium sulfate have low solubility values, meaning most of the solid will remain undissolved even in a relatively large volume of water.

About Solubility

The maximum amount of a solute that can dissolve in a given quantity of solvent at a specific temperature and pressure, typically expressed as grams.

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More Solubility Examples

Example 1 easy

Define solubility and explain how temperature generally affects the solubility of solids and gases i

Example 2 medium

Using a solubility curve, determine how many grams of [formula] can dissolve in [formula] g of water

Example 4 hard

Explain why a scuba diver must ascend slowly, using the concept of gas solubility and Henry's Law. W

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