A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth color changes over a wide range pH values to indicate the acidity or alkalinity of solutions.
Universal indicators are typically available in liquid or paper form. The liquid form is more versatile, as it can be used to test the pH of a variety of solutions. However, the paper form is more convenient, as it can be used to quickly test the pH of a small amount of solution.
To use a universal indicator, simply add a few drops of the liquid form to the solution you want to test, or dip a piece of the paper form into the solution. The color of the indicator will change depending on the pH of the solution. A chart is typically provided with the indicator to help you interpret the color change.
Universal indicators are a versatile tool that can be used to measure the pH of a variety of solutions. They are a quick and easy way to get an approximate pH reading, and they are relatively inexpensive.
Here is a table of the colors that a universal indicator typically changes to at different pH levels:
| pH | Color |
|---|---|
| 1 | Red |
| 2 | Pink |
| 3 | Orange |
| 4 | Yellow |
| 5 | Green |
| 6 | Blue-green |
| 7 | Blue |
| 8 | Purple |
| 9 | Violet |
| 10 | Red |
It is important to note that the colors of a universal indicator can vary depending on the brand and the specific compounds used in the indicator. It is always best to consult the chart that is provided with the indicator to get an accurate pH reading.
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