Question

When 280. mL of 1.50 x 10-4 M hydrochloric acid is added to 135 mL of 1.75 x 10-4 M Mg(OH)2, the resulting solution will be:

acidic.

basic

neutral.

It is impossible to tell from the information given.

Answer 1

Write the equation and balance it.
moles HCl = M x L
moles Mg(OH)2 = M x L
Determine which is the limiting reagent and that will determine that the OTHER reagent will be the one in excess. Go from there.

Answer 2

Neutral