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Chapter 3: Q14P (page 62)
Rewrite the number 3.123 56 (±0.167 89%) in the forms (a) number (± absolute uncertainty) and (b) number (± percent relative uncertainty) with an appropriate number of digits.
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Explain the difference between systematic and random error.
Cheryl, Cynthia, Carmen, and Chastity shot the following targets at Girl Scout camp. Match each target with the proper description.
(a) accurate and precise
(b) accurate but not precise
(c) precise but not accurate
(d) neither precise nor accurate
Express the molecular mass of with the correct number of significant figures.
Suppose that you used smaller volumetric apparatus to prepare solution by diluting role="math" localid="1663558223400" of wt\% up to . Find the uncertainty in0.250M.(Answer: .The uncertainty in density of concentratedoverwhelms all other smaller uncertainties in this procedure.)
You have a stock solution certified by a manufacturer to contain . You would like to dilute it by a factor of 100 to obtain . Two possible methods of dilution are stated below. For each method, calculate the resulting uncertainty in concentration. Use manufacturer's tolerances in Tables 2-3 and 2-4 for uncertainties. Explain why one method is more precise than the other.
(a) Dilute 10.00mL up to 100mL with a transfer pipet and volumetric flask. Then take 10.00mL of the dilute solution and dilute it again to 100mL.
(b) Dilute 1.000mL up to 100mL with a transfer pipet and volumetric flask.
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