AP BIOLOGY

Detailed explanation-1: -The addition of hydrocloric acid to water lowers the pH of water to a value less than 7.0 and makes an acidic solution.

Detailed explanation-2: -The hydrogen in concentration will increase when HCl is added to water. The pH will decrease below pH 7 because of the increased hydrogen ion concentration.

Detailed explanation-3: -If ever the water in your pool becomes too basic or alkaline, you can use hydrochloric acid to lower the pH levels.

Detailed explanation-4: -If you add acid to a solution the concentration of hydrogen ions (acidity) increases and the pH decreases.

Detailed explanation-5: -Adding water to an acid or base will change its pH. Water is mostly water molecules so adding water to an acid or base reduces the concentration of ions in the solution. When an acidic solution is diluted with water the concentration of H + ions decreases and the pH of the solution increases towards 7.