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noname [10]
3 years ago
8

When testing water for chemical impurities, results are often reported as BDL, that is, below detection limit. The following are

the measurements of the amount of blood in a series of water samples taken from inner - city households (in parts per million):
5, 7, 12, bdl, 10, 8, bdl, 20, 6
Chemistry
1 answer:
Mumz [18]3 years ago
4 0

Answer:

The median level in the water is 7ppm

Explanation:

LoB is assessed by calculating duplicates of a blank sample and evaluating the mean result and the standard deviation (SD). After evaluating this value LOD can be evaluated conferring to LOD=LOB+1.645(SD low concentration sample ). The quantitation limit can also be got from accuracy studies. LOD's may also be evaluated based on the standard deviation of the response (Sy) of the curve and the slope of the calibration curve (S) at levels resembling the LOD according to the formula: LOD = 3.3\frac{Sy}{S}

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Which of the following is TRUE? a neutral solution does not contain any H3O+ or OH- a neutral solution contains [H2O] = [H3O+] a
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Answer:

Options B and C

Explanation:

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d) a basic solution does not contain any H3O⁺. This option is wrong. Basic solutions are any solution that has a higher concentration of hydroxide ions than water. This means they contain H3O⁺ but  [OH⁻] is greater.

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Read 2 more answers
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