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.
The mouth normally contains a balance of different bacteria. Trench mouth occurs when there is an overgrowth of normal mouth bacteria. The gums become infected and develop painful ulcers. Viruses may be involved in allowing the bacteria to grow too much. Risks include the following: 1  Emotional stress. 2  Poor oral hygiene. 3  Poor nutrition. 4  Smoking. 5  Throat, tooth, or mouth infections.