An important property of the blood is its pH which is an indication of it''s acidity or basicity (alkalinity). The pH of blood ranges from 0 (highly acidic) to 14 (highly alkaline). A pH of 7 is neutral. Blood is normally slightly alkaline, with a normal pH range between 7.35 to 7.45. Usually the body maintains the pH of blood close to 7.40. Alkalosis is said to occur when the alkalinity of the blood increases. This may occur due to a fall in the acid level (or hydrogen ions) or a rise in the base level (bicarbonate ions).