What does a base release when it is placed in water? Select one:
a. Chloride ion (Cl-)
b. Hydronium ion (H3O+)
c. Calcium ion (Ca2+)
d. Hydroxide ion (OH-)

D - Hydroxide Ion (OH-)

Explanation:

A base provides either hydroxide ions (OH–) or other negatively charged ions that combine with hydrogen ions, reducing their concentration in the solution and thereby raising the pH. In cases where the base releases hydroxide ions, these ions bind to free hydrogen ions, generating new water molecules.

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2