Question

ca(oh)₂ is added to a large beaker of water. how is the solution different from the original water? the solution turns blue litmus to red. the solution turns phenolphthalein pink. the solution has more hydrogen ions. the solution has fewer hydroxide ions.

Explanation:

Calcium hydroxide ($Ca(OH)_2$) is a base. Bases turn phenolphthalein pink. They increase hydroxide - ion concentration and decrease hydrogen - ion concentration. Bases turn red litmus blue, not the other way around.

Answer:

The solution turns phenolphthalein pink.