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Ph of colourless aerated drinks
Generally drinks are basic solutions.
Soft drinks have a pH under 7.
pH indicator is a chemical compound that is added in small amounts to a solution so that the pH (acidity or alkalinity) of the solution can be determined easily. pH indicators are usually weak acids or bases themselves. They detect the presence of hydronium ions (H3O+) or hydrogen ions (H+).
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For fizzy drinks the pH scale is 6
The pH level is 2.7 for Monster Energy Drinks and most other energy drinks.
Soft drinks are generally acidic.
diet drinks
It indicates that the solution's range is above or below of its transition value. For example the transition value of phenolphthalein is around 9.0. Hence it shows a pink colour in basic solutions (pH>9) and colourless in acidic solutions.
The coffee is slightly acidic, a pH of approx. 5.