effects of impurities on boiling point

When common salt is added to crushed ice to make a freezing mixture the temperature is lowered below 0 o C. This is because ice absorbs heat from salt which is at a higher temperature and some ice melts dissolving some salt in it. This process continues till all the salt is dissolved or all the ic..

A liquid may be made to boil at any desired temperature by changing the external pressure. For example, a liquid may be made to boil at higher temperature by increasing the pressure on its surface, as is done in a pressure cooker. It may be made to boil at a lower tem..

Vapour pressure measures the tendency for the molecules to escape from liquid to the gas phase. At lower temperatures the vapour pressure of a liquid is much lower than the pressure on the surface of the liquid. When the temperature of the liquid is gradually increased, its vapour pressure also in..

Carboxylic acids have higher boiling point than aldehydes and ketones and even alcohols of comparable masses. This is due to more extensive association of carboxylic acid molecules through intermolecular hydrogen bonding...

The boiling points of alkenes gradually increase with an increase in the molecular mass (or chain length). This indicates that inter-molecular attractions become stronger with an increase in the size of the molecule. Branched chain alkenes have lower boiling poin..

Ammonia (240 K) has a higher boiling point than phosphine (190 K) and then the boiling point increases down the group because of increase in size. In PH 3 and other hydrides, the intermolecular forces are Van der Waals' forces. These van der Waals' forc..

Pure nitric acid boils at 86 o C. However it undergoes partial decomposition at this temperatur..

The melting and boiling points of group 14 elements are much higher as compared to those of group 13 elements. Explanation: It is because the atoms of group 14 can form four covalent bonds with each other and, therefore, there are strong binding forces between their atoms in bot..

The melting points and boiling points decrease on moving down the group. However, the decrease in melting points is not as regular as in boiling points..

Metals have high melting and boiling point. Tungsten has the highest melting point where as silver has low boiling point. Sodium and potassium have low melting points..