IB HL Intermolecular Forces

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Explain why HCl is more soluble in water than Cl2.

HCl is a polar molecule (forms ion-dipole interaction with water) while Cl2 is non polar

Explain why the melting point of HF does not follow the trend of the other hydrogen halides.

HF has hydrogen bonding as its main IMF; while HCl, HBr, HI have dipole-dipole which is a generally weaker IMF than Hydrogen bonding

Why is the melting point of HI higher than HBr?

HI has greater molar mass (more electrons) and so it has stronger dispersion forces than HBr

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