NaOH has a high melting point and conducts electricity in solution. H2O has a low melting point and does not conduct electricity. Explain, using the structure of each, why this is the case.

NaOH is an ionic compound with strong electrostatic attraction between the oppositely charged ions. This means the melting point is high, as the bonds need a lot of energy to overcome. When dissolved, the ions are free to move and can carry the electric charge through.
H2O is a simple covalent molecule. To melt H2O, the intermolecular forces must be broken, which are weak so require little energy to do so. H2O, as it is covalent, does not have any ions to carry a charge so will not conduct electricity.

ST
Answered by Sophie T. Chemistry tutor

7301 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

How does fractional distillation work?


Technetium is an element commonly used in medicine. A technetium atom is represented as ^99 _43 Tc. Give the number of protons, neutrons and electrons in this atom of technetium.


Calculate the concentration in mol/dm3 of 8.0 g of sodium hydroxide (NaOH) in solution with a volume of 50 cm3. (Note Ar(Na) = 23, Ar(O) = 16, Ar(H) = 1)


In fractional distillation the shorter hydrocarbons have lower boiling points and distil off first. Why?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences