Gr 9 Natural Sciences Ch 10: Indicators
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Questions and Answers

What is the primary advantage of using a pH meter over indicator solutions or papers?

  • They change color to indicate pH.
  • They provide quick and precise measurements. (correct)
  • They are cheaper than indicator papers.
  • They are easier to use.

    • Which of the following is an example of an acid-base indicator?

  • Litmus (correct)
  • Copper sulfate
  • Sodium chloride
  • Universal solvent

    • What color change does a universal indicator provide?

  • Only red or blue
  • Only pastel colors
  • A wide range of colors (correct)
  • No color change

    • In which scenario are pH meters particularly useful?

    <p>In laboratories requiring consistent accuracy</p> Signup and view all the answers

    Why are indicator solutions and papers considered tedious for frequent use?

    <p>They provide limited accuracy.</p> Signup and view all the answers

    What color does red cabbage water turn in acidic solutions?

    <p>Red or Pink</p> Signup and view all the answers

    Which of the following colors represents neutral solutions when using universal indicator?

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

    What color change occurs when litmus paper is exposed to acidic solutions?

    <p>Turns red</p> Signup and view all the answers

    In a strongly basic solution, red cabbage water changes to which color?

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

    What characteristic makes universal indicator more useful than litmus?

    <p>It provides color changes for a wide range of pH</p> Signup and view all the answers

    What color will slightly basic solutions turn red cabbage indicator?

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

    What is the primary pigment in red cabbage that causes color changes in different pH levels?

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

    What effect does litmus paper have in a basic solution?

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

    What is the main purpose of using universal indicator paper?

    <p>To offer a wide range of colors for accurate pH matching.</p> Signup and view all the answers

    Which feature distinguishes pH meters from other pH measurement methods?

    <p>They provide quick and precise pH measurements.</p> Signup and view all the answers

    Why is understanding acid-base indicators essential?

    <p>They help identify the pH of various substances through color changes.</p> Signup and view all the answers

    What is an advantage of using pH meters compared to indicator solutions?

    <p>They do not require visual comparison.</p> Signup and view all the answers

    Which of the following describes the limitations of using indicator solutions and papers frequently?

    <p>They can be cumbersome and time-consuming for regular pH testing.</p> Signup and view all the answers

    Which color indicates a strongly basic solution when using red cabbage water?

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

    What color does red cabbage water become in a neutral solution?

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

    Which of the following correctly describes the behavior of litmus paper in acidic solutions?

    <p>Turns red</p> Signup and view all the answers

    What color does a universal indicator show in weak acids?

    <p>Orange to yellow</p> Signup and view all the answers

    How can red cabbage indicator paper be created?

    <p>By soaking paper in red cabbage juice</p> Signup and view all the answers

    What color does a universal indicator show at neutral pH?

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

    In basic solutions, what color change occurs with blue litmus paper?

    <p>It remains blue</p> Signup and view all the answers

    Which of the following statements about universal indicators is true?

    <p>It changes color across a wide range of pH values</p> Signup and view all the answers

    What color does red cabbage water exhibit in a strongly basic solution?

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

    Which of the following describes the behavior of litmus in neutral solutions?

    <p>No color change</p> Signup and view all the answers

    Which range of colors does a universal indicator display in weak acids?

    <p>Orange to yellow</p> Signup and view all the answers

    How does the red cabbage juice's color change indicate a slightly basic solution?

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

    What characteristic of universal indicators provides more accuracy than litmus?

    <p>Wide range of color changes across pH levels</p> Signup and view all the answers

    What is the result of using blue litmus paper in acidic solutions?

    <p>Turns red</p> Signup and view all the answers

    What indicates the strongest acidity on a universal indicator scale?

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

    What happens to red cabbage water in neutral solutions?

    <p>Turns purple or violet</p> Signup and view all the answers

    Which of the following statements best highlights the precision level of different indicators?

    <p>Universal indicator is generally less precise than pH meters for scientific measurements.</p> Signup and view all the answers

    Which of the following characteristics is NOT associated with pH meters?

    <p>They use chemical indicators for pH measurement.</p> Signup and view all the answers

    Which option accurately describes a limitation of indicator solutions compared to pH meters?

    <p>Indicator solutions may not provide consistent measurements over time.</p> Signup and view all the answers

    What distinguishes universal indicators from other indicators in terms of color range?

    <p>Universal indicators offer a wide range of colors that correspond to a pH chart.</p> Signup and view all the answers

    In which scenario is using a pH meter predominantly advantageous over indicator solutions?

    <p>When conducting experiments that require real-time pH monitoring.</p> Signup and view all the answers

    What is the primary benefit of using universal indicator paper over red cabbage water for pH measurement?

    <p>Universal indicator paper matches a wide range of colors to a pH chart.</p> Signup and view all the answers

    In what way do pH meters outperform indicator solutions and papers?

    <p>They offer quick and precise pH measurements.</p> Signup and view all the answers

    Which statement best describes the primary limitation of using indicators like litmus for frequent pH measurements?

    <p>They can be tedious for frequent use.</p> Signup and view all the answers

    Why is understanding acid-base indicators crucial for scientific purposes?

    <p>They help in identifying the pH of various substances accurately.</p> Signup and view all the answers

    What distinguishes pH meters in terms of precision compared to other indicators?

    <p>They provide the most accurate pH readings.</p> Signup and view all the answers

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