What is the pH value of hydrochloric acid?

This depends on concentration AND type Example: pH = 1.0 for 0.10 mol/L acids which are strong and monoprotic (like HCl and HNO 3 ) 0.10 mol/L Acetic acid (weak, pKa=4.77) pH will be about 2.4 (in stead of 1.0 , if it were strong).

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