pH and Its Measurement
Chemistry ⇒ Acids, Bases, and Salts
pH and Its Measurement starts at 9 and continues till grade 12.
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See sample questions for grade 10
A solution has a pH of 13. Is it acidic, basic, or neutral?
A student adds a few drops of universal indicator to a solution and observes a green color. What is the approximate pH of the solution?
A student finds that a solution turns phenolphthalein pink. What can be inferred about the pH of the solution?
A student tests a solution with red litmus paper and observes no color change. What can be inferred about the solution?
Describe how a pH meter works.
A student adds a few drops of universal indicator to a solution and observes a green color. What is the approximate pH of the solution?
A student finds that a solution turns phenolphthalein pink. What can be inferred about the pH of the solution?
A student tests a solution with red litmus paper and observes no color change. What can be inferred about the solution?
Which indicator turns pink in a basic solution?
(1) Methyl orange
(2) Phenolphthalein
(3) Litmus
(4) Universal indicator
Which instrument is commonly used to measure the pH of a solution accurately?
(1) Thermometer
(2) pH meter
(3) Barometer
(4) Voltmeter
Which of the following household substances is most likely to have a pH above 10?
(1) Vinegar
(2) Lemon juice
(3) Baking soda solution
(4) Milk
Which of the following indicators is best for distinguishing between a strong acid and a strong base?
(1) Methyl orange
(2) Phenolphthalein
(3) Universal indicator
(4) Litmus
Fill in the blank: A solution with a pH less than 7 is called ______.
Fill in the blank: A solution with a pH of 9 is considered ______.
Fill in the blank: The pH of gastric juice in the human stomach is about ______.
Fill in the blank: The pH of human blood is approximately ______.
True or False: A basic solution has a higher concentration of hydroxide ions (OH-) than hydrogen ions (H+).
True or False: A pH of 7 always indicates a neutral solution.
True or False: pH can be affected by temperature.
True or False: The lower the pH value, the higher the concentration of hydrogen ions in the solution.
