Pure water has a neutral pH, and thus sits right in the middle of the pH scale at 7. However, once you add carbon dioxide to pure water, it combines to form carbonic acid. The carbonic acid has a slightly sour taste and a pH of between 3 and 4. But the pH will vary slightly depending on the water source and the manufacturer, and even from bottle to bottle. Some manufacturers add alkaline slats like sodium bicarbonate to reduce the water's acidity. To test the specific pH of your carbonated water, you will need a pH test strip.
Things You'll Need
- pH test strip
Pour a centimeter of the carbonated water into a small cup.
Remove a pH test strip from the package. Close the package.
Submerge the bottom tip of the test strip into the water. Drag the submerged tip back and forth over the surface of the water for 1 second. Or, follow the pH test strip's instructions for testing procedure.
Lift the pH test strip out of the carbonated water.
Shake off the excess liquid. Hold the strip for 10 seconds, or the amount of time recommended by the manufacturer, while the liquid climbs up the strip.
Compare the color of the pH test strip with the color chart on the packaging.
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