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12 March, 10:58

Pure water has a hydrogen ion concentration of 1 x 10 (-7) M and a ph of 7. A student measures a basic solution and finds that it has a hydrogen ion (H+) concentration of 1 x 10 (-3). Explain why the student must have made an error in her measurement.

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  1. 12 March, 11:31
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    The student must have made an error in her measurement in the concentration of hydrogen ion in the basic solution given. From her measurement, the concentration is 1 * 10-3 M. If we calculate the pH, we get:

    pH = - log (1 * 10-3) = 3

    A pH of 3 does not signifies a basic solution it is in the acidic range. So, the measurement is wrong.
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