Four 1.0 M solutions of HCl, NH3, NaOH and CH3COOH have been mislabelled, but a student has a pH meter to test the pH of the solutions. Arrange the solutions in order of increasing pH:
HCl (aq) < NH3 (aq) < NaOH (aq) < CH3COOH (aq)
CH3COOH (aq) < HCl (aq) < NH3 (aq) < NaOH (aq)
HCl (aq) < CH3COOH (aq) < NH3 (aq) < NaOH (aq)
NaOH (aq) < NH3 (aq) < CH3COOH (aq) < HCl (aq)
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