Dãy các bazơ làm phenolphthalein hoá đỏ:

NaOH; Ca(OH)2; Zn(OH)2; Mg(OH)2.

NaOH; Ca(OH)2; KOH; LiOH.

LiOH; Ba(OH)2; KOH; Al(OH)3.

LiOH; Ba(OH)2; Ca(OH)2; Fe(OH)3.