Study Guides/Chemistry/Explain Saturated Solution
Study Guide · Chemistry

What is a Saturated Solution in Chemistry?

When you mix sugar into a glass of water, it dissolves and disappears. But if you keep adding more and more sugar, eventually the water will refuse to dissolve any more. This everyday phenomenon is the perfect example of a 'Saturated Solution', a core concept in Class 9 Chemistry.

Question (Click to Flip)

What happens if you freeze a saturated solution?

Answer

If you cool a saturated solution, its capacity to hold the solute decreases. The dissolved salt or sugar will be forced out of the liquid and will instantly turn back into solid crystals at the bottom.

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Key Facts

The exact maximum amount of a solute (in grams) that can be dissolved in 100 grams of solvent at a specific temperature is called its 'Solubility'.

The beautiful rock candy (Mishri) that you eat is actually made by creating a hot, supersaturated sugar solution and letting it cool down to form giant crystals.

1. Definition of a Saturated Solution

  • A Saturated Solution is a chemical solution in which the maximum possible amount of solute (e.g., sugar/salt) has been dissolved in the solvent (e.g., water) at a specific given temperature.
  • Once a solution becomes saturated, if you add even one extra spoon of sugar, it will not dissolve. It will simply sink to the bottom of the glass and sit there as solid crystals.

2. Unsaturated vs Saturated

  • Unsaturated Solution: If you have a glass of water and add just one spoon of sugar, it dissolves easily. Because the water still has the 'capacity' to dissolve much more sugar, it is an unsaturated solution.
  • Saturated Solution: When the water reaches its absolute limit and says "I cannot take any more sugar," it has become saturated.

3. The Magic of Temperature (Supersaturation)

  • The saturation point is heavily dependent on temperature.
  • If you take that saturated glass of sugar water (where sugar is sitting at the bottom) and heat it on a stove, the hot water molecules spread apart. Suddenly, the leftover sugar dissolves!
  • Hot liquids can hold much more solute than cold liquids. When this hot solution cools down very slowly without the sugar crystallizing, it becomes a highly unstable Supersaturated Solution.

Questions and Answers

What happens if you freeze a saturated solution?+

If you cool a saturated solution, its capacity to hold the solute decreases. The dissolved salt or sugar will be forced out of the liquid and will instantly turn back into solid crystals at the bottom.

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