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 12
A laboratory technician needs to calibrate a pH meter. Which type of solution should be used for calibration?
A solution has a [H+] of 2 × 10-3 M. Calculate its pH (rounded to two decimal places).
A solution has a pH of 10. Is it acidic, basic, or neutral?
A solution has a pH of 13. What is its [OH-] in mol/L?
A laboratory technician needs to calibrate a pH meter. Which type of solution should be used for calibration?
A student measures the pH of rainwater and finds it to be 5.6. Is the rainwater acidic, basic, or neutral?
If a solution has a pH of 7 at 40°C, is it neutral? Explain.
The pH of gastric juice in the human stomach is about 1.5. Is this considered strongly acidic, weakly acidic, or neutral?
Which instrument is commonly used for accurate measurement of pH in laboratories?
(1) pH meter
(2) Thermometer
(3) Barometer
(4) Spectrophotometer
Which of the following indicators changes color at pH around 8.3 to 10?
(1) Methyl orange
(2) Phenolphthalein
(3) Bromothymol blue
(4) Litmus
Which of the following indicators is suitable for titrating a strong acid with a strong base?
(1) Methyl orange
(2) Phenolphthalein
(3) Bromothymol blue
(4) Litmus
Which of the following is NOT a method for measuring pH?
(1) Universal indicator
(2) pH meter
(3) Litmus paper
(4) Thermometer
A solution turns blue litmus paper red. Its pH is likely to be ________ than 7.
If a solution has a pH of 1, it is classified as a ________ acid.
If the pH of a solution decreases from 6 to 4, the concentration of H+ ions increases by a factor of ________.
The pH of a solution is defined as the negative logarithm (base 10) of the concentration of ________ ions.
True or False: A solution with a pH of 8 is basic.
True or False: The color of phenolphthalein in a solution with pH 4 is pink.
True or False: The pH of a 0.01 M HCl solution is 2.
True or False: The pH of a solution can be negative.
