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.
We dont even know exactly how many species there are, let alone how to count them or how fast they grow. Estimates of the number of bacterial species in the oral cavity vary between 500 to 650 different species. They live on the teeth and tongue, of course, but biofilms also cover the cheeks and oral mucosa.