H+ + OH- H2O
Bases have a pH greater than 7
Red litmus paper turns blue in contact with a base.
Phenolphthalein turns bright pink in a base.
Milk of Magnesia contains magnesium hydroxide, Mg(OH)2, which neutralizes stomach acid, HCl.
2 HCl + Mg(OH)2
MgCl2 + 2 H2O