Which of the following are ions, which are molecules, and which are both?

glucose, a nonelectrolyte
NaCl, a strong electrolyte
KNO3, a soluble salt
H2CO3, a weak electrolyte
HF, a weak electrolyte
CH3CH2OH, a nonelectrolyte

Answer:
glucose, C6H12O6, is a molecular substance which does not ionise in water
NaCl is an ionic substance which forms hydrated Na+ and Cl- ions in water
KNO3 is an ionic substance but the nitrate ion is a polyatomic (or molecular) ion
H2CO3 (carbonic acid) is a molecular substance which ionises slightly in water to give H+ and [HCO3]- ions
HF is a molecular substance which ionises slightly in water to give H+ and F- ions
CH3CH2OH (ethanol) is a molecular substance which does not ionise in water

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