1. The problem statement, all variables and given/known data To which of the following would the addition of an equal volume of 0.60 M NaOH lead to a solution having a lower pH? (a) water, (b) 0.30 M HCl, (c) 0.70 M KOH, (d) 0.40 M NaNO3. 2.The attempt at a solution the correct answer is 0.70 M KOH, and they say that by adding more OH you are producing a left shift. Okay, that's cool. My answer is 0.30 M HCl, this is because adding a strong acid will increase H+ concentration, OH- concentration will go down, therefore pH will decrease. Why is this wrong?