pH levels in Soft Drinks by wuzhengqin

VIEWS: 6 PAGES: 8

									BY RUDI AKER, BELLA DUNCAN, SARAH CLARKSON
AND DAVID S.
ACIDS IN SOFT DRINKS
Phosphoric Acid (H3PO4 )
CAS Registry number: 7664-38-2
Molar mass: 98.00g/mol



Citric Acid (C6H8O7 ∙ H2O)
CAS Registry number: 5949-29-1
Molar Mass: 210.14g/mol
HEALTH EFFECTS
There are virtually no health benefits in consuming soft
  drinks due to the high levels of sugars and chemicals.
  However there are several risks when consuming this
  product. These risks include, but are not limited to
  obesity, osteoporosis, diabetes, tooth decay, and heart
  disease.
LEVELS OF PH IN SOFT DRINKS
The pH levels in soft drinks range from 2.0-4.0, yet most fall between
the range of 2.5-3.0.


Example:
Pepsi has a pH level of 2.530 while Mug Root beer has a ph level of
4.038.
INSTRUMENTATION – PH ELECTRODE
The instrumentation necessary for this analysis is the pH
  electrode.
The pH electrode works by measuring the activity of the
  hydrogen ions which produces an electrical charge. The
  electrode procedure is based on a principle that
  electricity develops when two different substances (of
  different pH) come together at opposite sides of the
  glass membrane.
HOW TO CARRY OUT THE ANALYSIS
1. Plug the pH electrode into the computer
2. Make sure the computer program has
automatically turned on
3. Take the pH electrode and rinse it with
distilled water (so there is no
contamination)
4. Pat the pH electrode dry with paper
towel
5. Place the pH electrode into the solution
6. Get the pH reading from the computer
7. Take the pH electrode from the solution
and rinse it with distilled water
8. Pat the pH electrode dry with paper
towel
9. Continue doing steps 7-10 until each
solution has been tested
NECESSARY SKILLS AND INFORMATION
A few things that we will need to know to preform this analysis are:
 How to use the pH electrode
 How to compare pH levels
                                                       SOURCES
Phosphoric acid. (2011, November 17). Retrieved from
http://www.chemistry-reference.com/q_compounds.asp?CAS=7664-38-2

Citric acid, monohydrate msds. (2011, November). Retrieved from
http://www.sciencelab.com/msds.php?msdsId=9923495

Jacobson, M. F. (2005, June). Liquid candy. Retrieved from
http://www.cspinet.org/new/pdf/liquid_candy_final_w_new_supplemen
t.pdf

Jain, P., Nihill, P., Sobkowshi, J., & Agustin, M. Z. (2007, February 21).
Commercial soft drinks: ph and in vitro dissolution of enamel. Retrieved
from http://www.agd.org/support/articles/?ArtID=923

Seitz, J. (2008). Designing with ph electrodes. Retrieved from
www.national.com/assets/en/appnotes/national_AN-1852.pdf

								
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