Example: Calculate the pH of a buffer solution that initially consists of 0.0400 moles of ammonia and 0.0250 moles of ammonium ion, after 20.0 mL of 0.75 M NaOH has been added to the buffer. Ka for ammonium ion is 5.6 x 10 -10.
There are two types of bacteria. Aerobic bacteria live with oxygen, love the company of food particles in the mouth and feed on sugar. Anaerobic bacteria exist without oxygen and feed off dead skin cells and other bacteria.
There are estimated to be 200 species of bacteria living on each person, with 80 species of bacteria in the mouth alone. There are an average of 10 million individual bacteria on every square inch of your skin, with the number increasing as much as 1,000 fold in the teeth, mouth and digestive tract.