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Electric

F.A & F.Sc

What type of solute makes the Raoult’s law valid?

Raoult’s law is obeyed when the solute is non-volatile and non-electrolyte.  Read More →

April 3, 2011 | einfoadmin | No Comments | 434 views

On which depends the vapour pressure of a liquid in closed container?

When the vessel is closed then there is an equilibrium between the vapours and liquid of the substance. The value of vapour pressure of liquid only depends upon the temperature.  Read More →

| einfoadmin | No Comments | 161 views

Which will have the lowest vapour pressure?

From the given liquids water has maximum boiling point, so it has lowest vapour pressure at a given temperature.  Read More →

| einfoadmin | No Comments | 51 views

What will be the vapour pressure of the solution when non-volatile solute is added to a solvent?

A non-volatile solute in a volatile solvent decreases the vapour pressure of solvent. The reason is that molecules of solute which are non-volatile are also present on the surface of the solvent. So the number of molecules of the solvent per unit area of the surface becomes less and so the vapour pressure... readmore

| einfoadmin | No Comments | 486 views

What is called the pressure under which liquid and vapour can co-exist at equilibrium?

When the vapours and liquid co-exist then there is equilibrium between them at a constant temperature. The vapour pressure at this stage is called normal vapour pressure of the liquid.  Read More →

April 2, 2011 | einfoadmin | No Comments | 457 views

What is known that law which states that the relative lowering of vapour pressure is equal to the mole fraction of solute?

This is the third definition of Raoult’s law. According to which relative lowering of vapour pressure is equal to the mole fraction of the solution.  Read More →

| einfoadmin | No Comments | 560 views

What is called the number of moles of a solute per kg of solvent?

The number of moles of a solute per kg of solvent is called molality.  Read More →

| einfoadmin | No Comments | 322 views

One of the following methods of expressing concentration is independent of temperature. Which is that one?

Molality is such a unit of concentration in which solute and solvent both are in the terms of masses. The masses of substances are independent of the temperature.  Read More →

| einfoadmin | No Comments | 970 views

Due to what sugar is soluble in water?

The molecules of sugar have OH groups and they can make the hydrogen bonding with water. So, the solubility of sugar in water is due to hydrogen bonding.  Read More →

| einfoadmin | No Comments | 255 views

What happens when a crystal of solute is added into a supersaturated solution?

A supersaturated solution means that excess of the solute is settled down in a saturated solution. So when a crystal of solute is added then excess solute crystallizes out.  Read More →

| einfoadmin | No Comments | 775 views
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