This blog will cover and explain the specification for Edexcel triple science course 2013 Chemistry. Hope it helps :)
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Hydrochloric acid dissociates in water due to the latter's polarity....Hydrochloric acid will never dissociate in toluene as the latter is a non polar organic solvent...
what does polar mean?
The water molecules have a slight charge (delta positive for H and delta negative for oxygen) causing the the positve H plus ions to be attracted to the oxygen in theory and the chlorine to the hydrogen in the water molecule, this is what causes it to dissolve.