The pH of water is neutral, around pH 7. Chemicals and gases can change this to make it more acidic or more alkaline.
The pH level is a number that measures how acidic or alkaline a substance is on a scale of 0 to 14. For instance, if the level is 1, it means the substance is very acidic and if it is 13, it is very alkaline. Alkaline water has pH level of about 8 or 9 and pH level of normal tap water is 7, which is neutral.
Alkaline water has been praised by celebrities. It's claimed to have a multitude of health benefits, including weight loss, clear skin and even fighting cancer.