Advertisements
Advertisements
प्रश्न
Define solubility of a substance. How does it vary with temperature ?
Advertisements
उत्तर
Solubility is a property of a solid, liquid, or gaseous chemical solute to dissolve in a solid, liquid, or gaseous solvent to form a homogeneous solution.
Solubility of a given solute in a given solvent depends on temperature. For many solids dissolved in liquid water, the solubility increases with temperature up to 100°C. In liquid water at high temperatures (e.g., that approaching the critical temperature), the solubility of ionic solutes tends to decrease due to change in the property and structure of liquid water. The lower dielectric constant results in a less polar solvent.
Gaseous solutes exhibit more complex behavior with temperature. As the temperature is raised, gases usually become less soluble in water (to minimum, which is below 120°C for most permanent gases), but they are more soluble in organic solvents.
APPEARS IN
संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Name a metal which is soft and a non-metal which is hard.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
State two physical properties on the basis of which metals can be distinguished from non-metals.
How would you confirm that a colourless liquid given to your is pure water ?
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
In what respects does a true solution differ from a colloidal solution ?
What is meant by a solution?
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
Explain how, impure copper sulphate can be purified by crystallisation.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
The dyes present in fountain pen ink can be separated by the technique of :
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Compressibility of solids: ______.
Define the term matter.
