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A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [1]
A pH indicator or acid-base indicator is a compound that changes color in solution over a narrow range of pH values. Only a small amount of indicator compound is needed to produce a visible color change.
A pH indicator or acid-base indicator is a chemical added in a small amount to a solution that causes a color change depending on the pH. This is a charge of common indicators, an explanation of how they work, and tips for choosing the right one for your needs.
pH indicators are specific to the range of pH values one wishes to observe. For example, common indicators such as phenolphthalein, methyl red, and bromothymol blue are used to indicate pH ranges of about 8 to 10, 4.5 to 6, and 6 to 7.5 accordingly.
A properly selected acid-base indicator can be used to visually "indicate" the approximate pH of a sample. An indicator is usually some weak organic acid or base dye that changes colors at definite pH values.
A pH indicator, also known as an acid-base indicator, is a compound that changes colour in solution over a narrow pH range. To produce a visible colour change, only a small amount of indicator compound is required.
Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra.
pH indicators are weak acids that exist as natural dyes and indicate the concentration of H + ( H3O+ ) ions in a solution via color change. A pH value is determined from the negative logarithm of this concentration and is used to indicate the acidic, basic, or neutral character of the substance you are testing.
A universal indicator is a pH indicator that displays several color changes across a wide range of pH values. Like litmus paper and individual pH indicators, universal indicator indicates the acidity of alkalinity of solutions.
Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline. Because acidity and alkalinity relate to pH, they may also be known as pH indicators. Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice.