The concentration of OH- ions in a certain household ammonia solution is 0.0025. This ammonia solution is

Explanation

The concentration of OH- ions in the ammonia solution is 0.0025 M, which is significantly higher than the concentration of H+ ions in a neutral solution (1.0 x 10-7 M). This indicates that the solution is basic. Option A is correct because a higher concentration of OH- ions signifies a basic solution. Option B is incorrect as an acidic solution would have a higher concentration of H+ ions. Option C is incorrect because a neutral solution would have equal concentrations of H+ and OH- ions, around 1.0 x 10-7 M. Option D is incorrect as the solution clearly fits into the category of being basic.