### acid:

Selenic acid
* is acid
  - made by oxidation of selenium dioxide with hydrogen peroxide
+ Selenic acid, Preparation: Acids :: Selenium compounds
  * Selenic acid is made by oxidation of selenium dioxide with hydrogen peroxide. It is hard to evaporate it, but when it is evaporated, it makes colorless crystals. It can be made by oxidation of selenous acid with a strong oxidizing agent, such as potassium permanganate, chlorine, or bromine. The HCl and HBr made as a byproduct can reduce the selenic acic to selenous acid again, though, so it has to be taken out.

### acid:

Stearic acid
* fatty acid that occurs in virtually all fats.
* has a neutral effect on blood cholesterol.
* is an example of such a saturated fatty acid
  - another common fatty acid
  - chemical compounds
* is, in fact, known to actually reduce blood cholesterol levels.
* long chain fatty acid.
* makes candles burn more evenly.
* saturated acid, and so glyceryl tristearate saturated fat.
* saturated fatty acid found in beef, some dairy foods, and chocolate
  - mainly in animal products and a few plant foods

### acid:

Stomach acid
* Most stomach acid causes damage
  - contains acid
  - irritates esophagi
* Most stomach acid kills many microorganisms
* Some stomach acid destroys bacteria.
* activates the cysts and the trophozoites are released.
* are capable of destroying enzymes
  - important to digest foods
* breaks down food, but it can also digest the stomach wall itself
  - the metal, which causes anemia and sometimes death
* can also make a difference
  - damage the esophagus
* cause severe erosion of the teeth resulting in cavities.
  - serious damage
* dissolve the lead in the paint, allowing the lead to get into the bloodstream.
* dissolves the enamel on teeth.
* enhances absorption.
* erode the esophageal lining, leading to ulcers and possible rupture of the esophagus.
* increases calcium absorption.
* inhibit bacterial growth in stomach.
* is also important in producing ulcers
  - an important factor in absorption of nutrients, including magnesium
  - hydrochloric acid produced by the stomach
  - important to the absorption of zinc
  - produced by an acid pump in the chief cells
  - required for adequate breakdown of proteins
  - similar in strength to that of a car battery
  - thought to play a role in causing peptic ulcer disease
  - very dangerous
* kill most food borne bacteria, an important contribution to the immune system.
* kills most bacteria and other microorganisms present in food
  - microorganisms ingested in food or drink
* leaking into the esophagus common cause of chronic cough and even asthma.
* stops being secreted.

### acid:

Strong acid
* All strong acids are strong conductors of electricity.
* Many strong acids have a negative pKa value , which means they are very strong.
* Most strong acid dissolves food.
* Some strong acid destroys bacteria
  - helps food
* Some strong acid kills bacteria
  - plants
  - mixes with water
  - acids occur naturally on Earths surface, but they are relatively rare.
  * They also have a very low pH, usually between 1 and 3. Many strong acids have a negative pKa value, which means they are very strong
* are corrosive in nature
  - incompletely ionized acids
  - strong electrolytes
  - very concentrated acids
* can damage stainless steel and aluminum.
* cause burn on skin.
* dissociate almost completely in water solution.
* form conjugate bases which have no measurable strength in water.
* ionize completely or almost completely in dilute aqueous solution.
* produce solutions with a higher pH than weak acids.
* react with strong bases to form weaker acids and bases.

Stronger acid
* dissolve silver.
* have weaker conjugate bases.