Solubility of solid compounds in water

Some compounds dissolve in water very well. But there is a dissolving limit of water. After that limit, compound does not dissolve in water furthermore and deposit on the bottom of the solution. Solubility depends on temperature. We can express solubility as g/l , g/dm3.

Effect of temperature on solubility of solid compound

When temperature increases dissolving amount (solubility) increases.

Explain solubility of compound

Take sugar solution as an example.

First, some sugar is added to pure water sample and stir the mixture.You can see all sugar dissolve in water.

Again add some sugar to the sugar solution. Again that amount of sugar disappears by solving in the water.

Add more sugar to the sugar solution again and again. One time you can see, sugar does not dissolve furthermore and deposit on the botton of the solution.


Solubility definition

Maximum amount of mass of the compound which can dissolve in a unit volume of solvent. Usually we express solubility as grams per 100ml of solvent (g/100ml).

Solubility calculation

Example: Maximum 22.7g of solid compound A dissolve in 250ml of water.

  1. What is the solubility.Express it as g/100m
  2. How much sugar will dissolve in 1l of water
  1. solubility = 22.7 * (100/250)
    solubility = 9.08g/100ml of water

  2. dissolving mass in 1l = solubility * 1000/100
    dissolving mass in 1l = 9.08g/100ml * 1000/100
    dissolving mass in 1l = 90.8g

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