Question

How do boiling points relate to polar bonds?

Answer 1

Hint: ‌To‌ ‌determine‌ ‌the‌ ‌relation‌ ‌between‌ ‌boiling‌ ‌point‌ ‌and‌ ‌polar‌ ‌bonds‌ ‌we‌ ‌should‌ ‌know‌ ‌about‌ ‌polarity‌ ‌and‌ ‌what‌ ‌boiling‌ ‌means.‌ ‌The‌ ‌boiling‌ ‌is‌ ‌the‌ ‌heating‌ ‌of‌ ‌a‌ ‌substance.‌ ‌By‌ ‌heating‌ ‌the‌ ‌bond‌ ‌breaks.‌ ‌The‌ ‌temperature‌ ‌at‌ ‌which‌ ‌the‌ ‌bonds‌ ‌of‌ ‌substance‌ ‌breaks‌ ‌and‌ ‌the‌ ‌substance‌ ‌becomes‌ ‌volatile‌ ‌is‌ ‌the‌ ‌boiling‌ ‌point.‌ ‌Polarity‌ ‌tells‌ ‌the‌ ‌strength‌ ‌of‌ ‌a‌ ‌bond.‌ ‌

Complete answer:The temperature at which the vapour pressure of the liquid equals the vapour pressure of the surrounding then the liquid converts into vapour is known as boiling point.Polar bonds are the bonds between two ions or the bonds between ions are known as polar bonds. The molecule bonded by polar bonds has two ions cation and anion. The electrons of anion are attracted towards the positive charge of cation and cation also attracts the electron of anion so, both ions come as close as possible so, a polar bond becomes shorter and stronger.More the charge separation means the high positive charge on cation and high negative charge on the anion introduce the more polarity in the bond cause the more stability of the polar bonds.The stable and stronger bond requires high energy to break. In boiling the bonds break the atoms apart and the substance becomes volatile.So, a polar bond requires high energy for boiling thus we have to increase the boiling temperature or we can say the boiling point of the substance will be high.Therefore, the boiling point is directly proportional to the polarity of the bond. More polar the bond high will be its boiling point. Less polar the bond low will be its boiling point.

Note:The difference between polar natures of both bonded ions and the charge separation is determined in terms of polarity. Polarity is affected by the amount of charge and size of ions. On increasing the strength of the polar bond, the boiling point increases. The polarity of a bond depends upon the electronegativity of the bonded atoms.