Answer:
1) H30+ or H+ concentration is 0.0045M.
2) OH- concentration is 2.2 * 10^-12 M
3) pH = 2.35
Explanation:
1) HCl is strong acid so it completely dissociates which means you have
HCl------> H+ + Cl-
0-------> 0.0045 M, 0.0045M
We know now that H30+ or H+ concentration is 0.0045M.
2) H3O+ and OH- are related via the auto ionization of water.
Kw = 1.0*10^-14
(H3O) * (OH-) = 1.0*10^-14
OH- = ( 1.0*10^-14) / (0.0045) = 2.2 * 10^-12 M
3) pH measures the acidity based on the amount of hydrogen/hydronium ions in solution. H+ and H3O+ are both the same thing (either way it permissible to write)
The formula is pH= - log (H+) [now we just plug in the H+ we found)
pH = - log [0.0045] = 2.35
