# How do you know HCl is a strong acid?

Jan 6, 2018

Because it completely disassociates in solution another way of saying that is that it completely ionises in solution.

#### Explanation:

$H C {l}_{S} \to {H}^{+} + C {l}^{-}$

Have a look at this webpage

http://www.bbc.co.uk/schools/gcsebitesize/science/triple_ocr_gateway/how_much/strong_weak_acids/revision/1/

Hope it helps :)