Question

What color would you predict milk of magnesium to turn red and blue litmus paper?

a. red will turn blue, blue will remain the same
b. both will remain the same
c. blue will turn red, red will remain the same
d. none of the above

Answer 1

Milk of magnesia is chemically known as magnesium hydroxide. Although this compound isn't very water soluble, the small amount that does dissolve acts as a base. Thus, milk of magnesia is somewhat basic, and litmus paper would turn blue if exposed to it.