Remember that HCl is a strong, binary acid. Recall that strong acids completely dissociate in water and that acids donate H+ to the base (water in this case). The dissociation of HCl is as follows:
HCl(aq) + H2O(l) → H3O+(aq) + Cl–(aq)
What is the pH of a 4.2×10–4 M HCl solution at 25°C?
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