AP BIOLOGY

Detailed explanation-1: -When an acid is dissolved in water, it furnishes hydrogen ions, and consequently, the concentration of hydrogen ions H + increases in the solution. The reaction is highly exothermic in nature due to the production of heat.

Detailed explanation-2: -An acid is a substance or compound that releases hydrogen ions (H+) when in solution. In a strong acid, such as hydrochloric acid (HCl), all hydrogen ions (H+), and chloride ions (Cl-) dissociate (separate) when placed in water and these ions are no longer held together by ionic bonding.

Detailed explanation-3: -An Arrhenius acid is therefore any substance that ionizes when it dissolves in water to give the H+, or hydrogen, ion.

Detailed explanation-4: -Answer: An acid produces hydrogen ions in solution because it reacts with the water molecules by giving a proton to them. When hydrogen chloride gas dissolves in water to produce hydrochloric acid, the hydrogen chloride molecule gives a proton (a hydrogen ion) to a water molecule.