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.
If mouth bacteria are linked to diseases elsewhere in the body they will provide the basis for simple diagnostic tests that can be used as early predictors of disease. And knowledge of friendly mouth bacteria is spearheading the development of more chewing gums and toothpastes containing the helpful bugs. The idea is that their presence will prevent harmful bacteria from sticking to teeth and causing damage.