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A universal indicator is a mixture of dyes that begin with green color, but while added to a solution it changes color. The color that changes, not only specifies that the substance is acidic or basic, but it can show the position on the pH scale from 0 to Colors ranging from yellow to red specify an acidic solution, blue to violet indicate alkali, and green indicates a neutral solution.
The major difference between the litmus paper and the universal indicator is that the universal indicators can change a range of various colors, so it is useful in determining the strength of an acid or base, while the litmus paper only gives you an indication of whether the substance is an acid or alkali; it doesn't tell us about the strength of the acid or the base. Litmus paper is used in tests where only the acidic or basic nature of the substance is involved, while the universal indicator is used in tests were to know the pH of a substance.
You may also like this. Applications of pH. Difference between pH paper and universal indicator. Whereas blue litmus papers turn red when encounter with an acidic solution. The neutral litmus papers are purple in color. The color change of litmus papers is taking place over pH range 4. Therefore, one of the disadvantages of litmus papers is that they cannot be used to determine the pH value. The strength of the acidity or the basicity also cannot be determined using litmus papers, on the other hand, the readings are instantaneous, and easy to take.
Litmus papers can be used by anyone without any expertise knowledge. They only have to know which color is relevant to acidic and basic pH value. The scale has numbers from 1 to Pure water is said to be having pH 7. It turns purple in neutral solutions.
Litmus paper is usually more reliable, and comes as red litmus paper and blue litmus paper. The table shows the colour changes it can make. Notice how we say 'stays red'. This is better than saying 'nothing' or 'stayed the same', because it tells us the colour we actually see. Universal indicator is supplied as a solution or as universal indicator paper.
It is a mixture of several different indicators.
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