Question

3. The indicators which turn red in acidic solution are
(a) turmeric and litmus.
(b) phenolphthalein and methyl orange.
(c) litmus and methyl orange.
(d) phenolphthalein and litmus.​

Answer 1

litmus and methyl orange

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Answer 2

The indicators which turn red in acidic solution are (c) litmus and methyl orange.

Acid-Base indicators:

• Compounds called acid-base indicators undergo color changes as a result of protonation or deprotonation.
• Indicators can be used to determine the equivalency point of an acid-base titration because this color shift occurs across a defined pH range.
• In order to measure the pH of a solution visually, a little amount of a halochromic chemical component is added to the solution.
• In the Arrhenius model, a pH indicator is a chemical detector for hydrogen or hydronium ions.

Litmus:

• A combination of several colors taken from lichens and made water-soluble is known as litmus.
• One of the earliest kinds of pH indicators, used to assess the acidity of materials, is frequently produced by its absorption onto filter paper.

Methyl orange:

• Methyl orange is a pH indicator that is often used in titration due to its distinct and visible color variation at various pH levels.
• In acidic and basic media, methyl orange exhibits red and yellow colors, respectively.
• It is frequently employed in the titration of acids since it changes color at the pKa of a mid-strength acid.

Phenolphthalein:

• Organic chemical phenolphthalein is employed as a cathartic in medicine.
• It serves as an indicator in acid-base titration.
• Indicator-wise, it changes color from pink to red in alkaline solutions and goes colorless in acidic ones.

Turmeric:

• An acid-base indicator is a turmeric.
• It turns bright crimson when it interacts with bases.
• When acids are introduced, the indicator's red form can turn back into yellow.

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