Solutions Test - 11

Size of Helium is small so does not causes “Bents” to divers when the dive back to surface. As it is less soluble.

Because of hydrogen bonding.

Both hexane and n-octane are non-polar, so they mix easily.

High pressure increases the boiling point of water so it reduces the cooking time.

As pressure increases boiling point also increases.

A solute distributes itself between two immiscible liquids. Ratio of conc. of solute in liquid1 and liquid 2 is constant.

Camphor has very high cryoscopic constant.

Adding ethylene glycol to water reduces the freezing point of water. Water freezes at temperatures much less than 0 degree Celsius when ethylene glycol is added to it. It is used as an anti-freeze. This practice was mostly practiced in older radiators in cold weather conditions. Modern radiators use coolants that contain ethylene glycol, propylene glycol, 1,3 butylene glycol, hexylene glycol, diethylene glycol or glycerin for which we don't need to add any extra glycol.

Another aspect of using the glycols is that they have a higher boiling point(197 deg C) as compared to water. Hence, they don’t get vapourised easily inside the radiator. They also have a higher specific heat capacity for which they are capable of transferring more heat from the engine as compared to water.

Density of water = 1g/mL
Volume of 900g of water = 900mL
Moles of water = Given mass/Molecular mass = 900/18 = 50mol
Molarity of water = 50/900×1000 = 55.55M