To increase your body's pH, take 1/4 tsp. of baking soda dissolved in one-half glass of water on an empty stomach, once in the morning and again before bedtime. Acidity and alkalinity is measured by pH, which ranges from 0 to 14 with 7.0 being neutral; a pH above 7.0 is alkaline, and below 7.0 is acidic. Baking soda has the highest pH of 14. Create a healthy body by keeping your body's pH between 7.1 and 7.5.