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Chapter 3: Q7 P (page 61)
Write each answer with the correct number of significant figures.
(a)
(b) 106.9 - 31.4 = 75.5000
(c)
(d)
(e
(f)
(g)
(h)
a) 12.3
b) 75.5
c)
d) 3.04
e)
f) 11.9
g) 4.600
h)role="math" localid="1663324058547"
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(a) How many millilitres of with a density of will you need to prepare 2.000L of 0.169M NaOH ?
(b) If the uncertainty in delivering NaOH is , calculate the absolute uncertainty in the molarity (0.169M). Assume there is negligible uncertainty in the formula mass of NaOH and in the final volume (2.000L).
If uncertainty in pHis doubledto, what is the relative uncertainty in?
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.
We can measure the concentration of HCI solution by reaction with pure sodium carbonate: required of HCI .
(a) Find the formula mass (and its uncertainty) for .
(b) Find the molarity of the HCI and its absolute uncertainty.
(c) The purity of primary standard is stated to be 99.95 to 100.5wt % , which means that it can react with of the theoretical amount of . Recalculate your answer to (b) with this additional uncertainty.
State whether the errors in (a)-(d) are random or systematic:
(a) A 25 - mL transfer pipet consistently delivers .
(b) A 10 - mL buret consistently delivers role="math" localid="1663303542431" when drained from exactly 0 to exactly 2mL and consistently delivers 2.03mL0.02mL when drained from 2 to 4mL .
(c) A 10 - mL buret delivered 1.9839g of water when drained from exactly 0.00 to 2.00mL . The next time I delivered water from the 0.00 to the 2.00mL mark, the delivered mass was .
(d) Four consecutive 20.0 - L injections of a solution into a chromatograph were made and the area of a particular peak was 4383 , 4410, 4401 , and 4390 units.
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