pH is a measure of how acidic or alkaline a substance is. It is measured on a scale of 0 to 14, with 0 being the most acidic and 14 being the most alkaline. Water has a pH of 7, which is neutral. Decreasing the pH of water makes it more acidic.
There are several ways to decrease the pH of water. One way is to add an acid to the water. Acids release hydrogen ions (H+) into the water, which lowers the pH. Another way to decrease the pH of water is to pass it through a reverse osmosis system. Reverse osmosis systems remove impurities from the water, including minerals that can raise the pH. Finally, you can also boil water to decrease its pH. Boiling water drives off carbon dioxide (CO2), which is a weak acid. Removing CO2 from the water raises the pH.
