What type of ion does the substance give off if it turns the pH paper blue?

Alkaline

Explanation:

In an alkaline solution, red litmus paper turns blue. When an alkaline compound dissolves in water, it produces hydroxide ions, which cause the solution to become alkaline.

The alkaline solution that turns the ph paper to blue and it produces hydrogen ions.

Explanation:

pH is defined as a measure of acid or alkaline level in the water and it indicates the amount of hydrogen molecules in the water. pH value ranges from [0-14], for acidic components pH7 and for neutral pH=7. Litmus paper measures the pH values and for acid the color of litmus paper changes from blue to red. For base solutions, the color changes from red to blue. Alkaline solutions change the pH value from red to blue, when it is dissolved in water.