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Congo red is a synthetic dye that exhibits acidic properties. It is often used as a pH indicator, changing color from blue in alkaline solutions to red in acidic environments. This characteristic makes it useful in various applications, including biological staining and pH testing.
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Which of the following is an example of an acidic stain?
Basic dyes: Crystal violet, Methylene blue, Malachite green, Safranin. Acidic dyes: Nigrosin, Congo red
Is Congo red a basic or acidic substance?
Congo red is an azo dye that acts as a pH indicator and is classified as an acidic substance. It changes color depending on the pH of the solution, appearing red in acidic conditions and blue in alkaline conditions. Due to its structure, it can donate protons, which contributes to its acidic behavior.
What is another example of a acidic dye besides Congo red?
Nigrosin
What is the color of Congo red in base solution?
changes to violet in basic solution
What is an acidic solution will turn blue litmus paper to what color?
Red color in acidic solutions and blue color in basic solutions.
What colour is cyanidin in acidic solutions?
Cyanidin is red in acidic solution, and blue in basic solution
How is paper helpful?
It helps in indicating whether a substance is acidic or basic A red litmus paper turns blue in basic solution and turns red in acidic solution A blue litmus paper turns red in acidic solution and turns darker blue in basic solution
What color does the limtus paper turn into?
Red color in acidic solutions and blue color in basic solutions.
If a solution is basic- what color will red litmus paper turn?
Red color in acidic solutions and blue color in basic solutions.
What color does blue litmus paper turn when immersed into an acid?
Blue Litmus Paper turns red when it is placed in an acid
What is the colour of phenolphthalein indicators in acidic and basic properties?
In acid conditions it is colorless and in basic conditions it is pink and then bright red
Is Red Acid or base?
Litmus paper is red for acidic solutions and is blue for basic solutions.
