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's a slew of bacteria floating around in your mouth, but it's generally harmless. Since people have different eating habits in different places, you might think an American's saliva might look a lot different from, say, a South African's. Saliva contains more DNA than blood because of all of the oral bacteria. 2  Most common type of bacteria in saliva is Streptococcus, in a mostly harmless form. 3  Saliva spreads molecules to the taste receptors on the tongue.