Home

Home
Common Compounds
Exam Guide
FAQ
Features
Glossary
Construction Kits
Companion Notes
Just Ask Antoine!
Simulations
Slide Index
Toolbox
Tutorial Index

FAQ
Introduction
Measurement
Matter
Atoms & ions
Compounds
Chemical change
The mole
Gases
Energy & change
The quantum theory
Electrons in atoms
The periodic table
Chemical bonds
Solids
Liquids
Solutions
Acids & bases
Redox reactions
Reaction rates
Organic chemistry
Everyday chemistry
Inorganic chemistry
Environmental chemistry
Laboratory
History of chemistry
Miscellaneous


Home :FAQ :Chemistry of everyday lifePrint | Comment
Previous Question Next Question

Antinausea syrup and soda pop have many of the same ingredients- what's the difference?

I purchased an Nausea control liquid syrup product made by Valu-Rite at a local pharmacy. The active ingredients are : phosphoric acid, dextrose (glucose), levulose (fructose), with a few inactive ingredients like glycerin and food coloring.

These ingredients don't sound much different than the corn syrup and phosphoric acid in carbonated sodas. Maybe I should have just bought a can of pop?
Andrew prints@mn.uswest.net

Mild nausea caused by stomach irritation is often treated with a 'phosphorylated carbohydrate syrup'. As you've noticed, the composition of the syrup is very similar to soda pop. You'll get essentially the same benefits from the pop, but there are a few differences:

  • The bubbles in carbonated drinks are a source of stomach irritation, so you'll have to let the pop go flat before using it for this purpose.
  • The syrup probably does a better job of coating the stomach than the pop would.
  • The syrup doesn't contain caffeine, while some pop does.

Additional acid contributes to irritation. So why doesn't the phosphoric acid irritate the stomach? At high concentrations, it's nasty stuff. The phosphoric acid in the syrup is very dilute, and it is not fully protonated (if the syrup has a pH of around 2.5-3, it's mostly H2PO4- with a smaller amount of H3PO4). The phosphoric acid has a pK1 of 7.5× 10-3) and so can buffer as H3PO4/H2PO4- around a pH of 2.1. The pH of normal stomach contents is typically lower than this (about 1.6 to 1.8). So the phosphoric acid in the syrup won't lower stomach pH by dissociating.

You might want to visit Quickcare's resource for more information about nausea prevention. They specifically suggest flat soda pop, non-acidic fruit juices, and popsicles as prevention for nausea!

Author: Fred Senese senese@antoine.frostburg.edu



General Chemistry Online! Antinausea syrup and soda pop have many of the same ingredients- what's the difference?

Copyright © 1997-2010 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 02/23/18.URL: http://antoine.frostburg.edu/chem/senese/101/consumer/faq/antinausea-syrup.shtml