Acid-Base Indicators Quiz

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Questions and Answers

What color is methyl orange when it is in a solution that has a pH of 3.5?

  • Yellow
  • Orange
  • Pil (correct)
  • Red

What color is methyl red when it is in a solution that has a pH of 5?

  • Red
  • Yellow (correct)
  • Orange
  • Pink

What color is phenolphthalein when it is in a solution that has a pH of 8.5?

  • Colorless
  • Yellow
  • Orange
  • Pink (correct)

What color is thymolphthalein when it is in a solution that has a pH of 10.2?

<p>Pink (C)</p> Signup and view all the answers

What color is bromthymol blue when it is in a solution that has a pH of 6.5?

<p>Yellow (D)</p> Signup and view all the answers

What color is bromocresol green when it is in a solution that has a pH of 4?

<p>Yellow (A)</p> Signup and view all the answers

What is the pH range of methyl orange indicator?

<p>3.1 - 4.5</p> Signup and view all the answers

What is the pH range of methyl red indicator?

<p>4.2 - 6.2</p> Signup and view all the answers

What is the pH range of phenolphthalein indicator?

<p>8.3 - 10</p> Signup and view all the answers

What is the pH range of thymolphthalein indicator?

<p>9.3 - 10.5</p> Signup and view all the answers

What is the pH range of bromthymol blue indicator?

<p>6.0 - 7.5</p> Signup and view all the answers

What is the pH range of bromocresol green indicator?

<p>3.8 - 4.6</p> Signup and view all the answers

What is the name of the indicator that changes color from colorless to pink?

<p>Phenolphthalein</p> Signup and view all the answers

What is the name of the indicator that changes color from yellow to blue?

<p>Bromthymol blue</p> Signup and view all the answers

Flashcards

Methyl Orange pH Range

Methyl orange changes color between pH 3.1 and 4.5, from pink to yellow.

Methyl Red pH Range

Methyl red changes color from pH 4.2 to 6.2, from pink to yellow.

Phenolphthalein pH Range

Phenolphthalein changes color at a pH range of 8.3 to 10, from colorless to pink.

Thymolphthalein pH Range

Thymolphthalein changes color at a pH between 9.3 and 10.5, from colorless to pink.

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Bromothymol Blue pH Range

Bromothymol blue changes color between pH 6.0 and 7.5, from yellow to blue.

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Bromocresol Green pH Range

Bromocresol green shows a color change between pH 3.8 and 4.6, from yellow to blue.

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Study Notes

pH Range and Color Change of Acid-Base Indicators

  • Methyl Orange:

    • Color Change: Pink to Yellow
    • pH Range: 3.1 - 4.5

  • Methyl Red:

    • Color Change: Pink to Yellow
    • pH Range: 4.2 - 6.2

  • Phenolphthalein:

    • Color Change: Colourless to Pink
    • pH Range: 8.3 - 10.0

  • Thymolphthalein:

    • Color Change: Colourless to Pink
    • pH Range: 9.3 - 10.5

  • Bromothymol Blue:

    • Color Change: Orange to Blue
    • pH Range: 6.0 - 7.5

  • Bromocresol Green:

    • Color Change: Yellow to Blue
    • pH Range: 3.8 - 4.6

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