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.
Biofilms form almost everywhere bacteria are. In the mouth, they naturally form on any stationary surface, namely teeth, gums, and the tongue. Leeuwenhoek made important findings of bacteria with his first observation and analysis of dental plaque, and since then much more has been discovered about the mouth and its ecology. Ecology and types