Question

Using your knowledge of strong and weak acids, arrange the following solutions in order from lowest pH to highest pH. Which solution has the highest concentration of free H+?

0.010 M HCl, 0.010 M NaOH, 0.010 M Acetic acid, 1.0 M NaOH, 0.0010 M Acetic acid, 1.0 M HCl, 0.010 M NaHCO3,

Answer 1

strong acids or bases, assume 100% dissociation. For monoprotic acids/bases refer to the following:
For acids, pH = -log [H+]
For bases, pH = 14 - pOH = 14 - log [OH-]

Weak acids have < 100% dissociation (typically < 10%) and will depend on the pKa, pKb.

Answer 2

from more basic to more acidic I will sorted as follow
1.0 M NaOH,
0.010 M NaOH
0.010 M NaHCO3,
0.0010 M Acetic acid,
0.010 M Acetic acid,
0.010 M HCl,
1.0 M HCl,