Wednesday, February 2, 2011

pH Scale by Desiree, Rio, Maede, Mahtab

The pH scale's use is to indicate the acidity or basicity of a solution. The acidity is based on the amount of Hydrogen ions (H+) and the basicity is based on the amount of Hydroxide ions (OH-).
Acids
  • taste sour, sharp (ex: Orange)
  • Reacts with OH- to form H2O
  • Low pH value
  • destructive in high amounts
  • acidity in the human body: Stomach acid (1), Urine (6), Saliva (6.5)
Bases
  • Bitter, slippery (ex: Soap)
  • Reacts with H+
  • Has a high pH value
  • destructive in high amounts
  • bases in the human body: Stomach antacids (9), Blood (7.4)
From 0 to 7 presents the acids, 7 is neutral (water and tears) while the bases are the number range of 7-14.

Litmus Test

Is used to find out the acidity or the base amount of a solution by means of vegetable dye which changes depending on the amount of Hydrogen or Hydroxide ions.
  • Blue to red = acid
  • Red to blue = base
A buffer is either a chemical or compound that keeps a constant pH level.
  • Example: Our blood has a pH value of 7.4, and hemoglobin and bicarbonate ions acts as a buffer in human blood.
Posted by at

4 comments:

  1. CooperFebruary 3, 2011 at 9:30 AM

    characteristics of bases would be nice to have

    ReplyDelete
  2. J. McGowanFebruary 3, 2011 at 1:02 PM

    Why is pH important in biological systems?

    ReplyDelete
  3. Mariah IFebruary 3, 2011 at 5:55 PM

    Maybe a little more information on any bases in the body.

    ReplyDelete
  4. RioSFebruary 5, 2011 at 11:09 PM

    WHY IS PH SO IMPORTANT IN BIOLOGICAL SYSTEMS?

    pH is important in the body because if there is an extreme amount of basicity or acidity it is detrimental to cellular structure that is why buffers in the human blood are so important, they keep the pH balanced in the human body so our cells don't fall apart

    ReplyDelete

Subscribe to: Post Comments (Atom)