MCQ for How to use pH meters

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Question 1: Which of the following is an accurate method to determine the pH of an aqueous solution?
  • INCORRECT. Using this method, the pH of an aqueous solution can be approximately measured only. Please try again.
  • INCORRECT. Using this method, the pH of an aqueous solution can be approximately measured only. Please try again.
  • INCORRECT. Using this method, the pH of an aqueous solution can be approximately measured only. Please try again.
  • CORRECT. Accurate determinations of pH can be done using pH meter.
Question 2: Classical pH meter in chemical or clinical laboratory is made with a glass electrode that is selectively sensitive to ______ concentration.
  • INCORRECT. Please try again.
  • INCORRECT! Please try again.
  • CORRECT! The glass electrode is selectively sensitive to H+ concentration but insensitive to Na+, K+, and other cations.
  • INCORRECT! Please try again.
Question 3: Calibration should be performed with at least _________buffer(s) that span of range of pH to be measured.

  • INCORRECT. Please try again.
  • CORRECT. At least two buffer should be used.
  • INCORRECT. Please try again.
  • INCORRECT. Please try again.
Question 4: pH meter gives an electrical response proportional to the concentration of hydrogen ion. To convert this response into pH, glass electrode must be calibrated against standard solution of known H+ concentration. Which of the following standard solution(s) is/are likely to be used.
  • INCORRECT. It is not the only one. Please try again.
  • INCORRECT. It is not the only one. Please try again.
  • INCORRECT. It is not the only one. Please try again.
  • CORRECT. They are known pH buffer solutions commonly used for calibration.
Question 5: After each single measurement, the probe is rinsed with ____________ to remove any trace of the solution being measured.
I. Ionized water
II. Distilled water
III. Deionized water
  • INCORRECT. Please try again.
  • INCORRECT. One is incorrect. Please try again.
  • CORRECT. The probe is rinsed with distilled water or deionized water to remove any traces of the solution being measured.
  • INCORRECT. Two of them is correct. Please try again.