You aren't sure if your pH meter needs to be calibrated, so you put it in a buffer solution that has a known pH of 7. You take four separate readings of the solution with the pH meter. The meter reports the pH as 5.5, 8.6, 6.3, and 9.4. Were the measurements accurate, precise, neither, or both?

Question

Braxton Lambert

Chemistry

28 October, 22:36

You aren't sure if your pH meter needs to be calibrated, so you put it in a buffer solution that has a known pH of 7. You take four separate readings of the solution with the pH meter. The meter reports the pH as 5.5, 8.6, 6.3, and 9.4. Were the measurements accurate, precise, neither, or both?

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Answers (1)

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Mason Stephenson · Answer 1

Neither

Explanation:

Even though the average between the 4 measurements is 7.45, the measurements are not accurate. This is probably due to the pH meter being out of calibration or because there is some contamination in the buffer solution