pH color chart to
determine the pH level
A common method to measure the pH level is to use a pH indicator and the related pH color chart. There are several methods to measure pH. However, the two most common methods are the indicator, or visual method, and the potentiometric method.
The visual method
To use the visual method is simple. A pH
sensitive indicator is placed in the measured solution and the
indicator will change color depending on the pH level. To get the pH
value, compare the color to the pH chart that comes with the indicator.
The accuracy of this method is, for obvious reasons, low. However, it
can be used for a rough estimation of the pH level.
The pH indicator can either be a chemical indicator or a special pH paper, so-called pH testing strips.
Nature's own tester
The color of a hydrangea flower depends partly on the pH of the soil it is planted in. In acid soils the flowers will be blue, in alkaline soils the flowers will be pink or purple, and in neutral soil the flowers will be white.
The potentiometric method
The
most accurate and reliable method is to use a potentiometric sensor (pH
electrode), connected to a voltmeter (pH meter). A pH meter and sensor
are, of course, more costly than a pH indicator.
The main focus
of this site is the potentiometric method. Please, go ahead. Use the
Navbar to the left to continue to navigate through this site and learn
more about the pH meter, the pH sensor and pH measurements.
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Red cabbage ph indicator 
Some fruits and vegetables contain a chemical that will change colors if it is mixed with acids or bases. A common example is red cabbage. Red cabbage …
