David has bleach and water and mixes them together.

A. Did David increase or decrease the pH of the water?

B. What type of ion was added to the water?

A) increase Ph B) incorporated ions: Na⁺ and ClO⁻

Explanation:

Bleach is the regular name for sodium hypochlorite (NaClO). This salt is basically composed by the cation sodium (Na⁺) and anion hypochlorite (ClO⁻), and when dissolved in water, this salt makes Ph goes above 7, this is, a basic Ph (will be increased) - have in mind that, a Ph below 7 is acid, and a Ph above 7 is basic)

This will occur since, when ClO⁻ is dissolved in water:

ClO⁻ + H2O → HClO + OH⁻ according to this reaction, the hydroxyl anion will increase the Ph of the water

Finally, when dissolving bleach in water, you will be incorporating ions Na⁺ (sodium) and ClO⁻ (hypochlorite)