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Chapter 3: Q21P (page 63)
Express the molecular mass of with the correct number of significant figures.
The molecular mass of with the correct number of significant figures =
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If uncertainty in pHis doubledto, what is the relative uncertainty in?
Avogadro's number can be computed from the following measured properties of pure crystalline silicon:
(1) atomic mass (obtained from the mass and abundance of each isotope), (2) density of the crystal, (3) size of the unit cell (the smallest repeating unit in the crystal), and (4) number of atoms in the unit cell. For the material that was used, the average atomic mass of Si is role="math" localid="1663313481329" , where 35 is the uncertainty (standard deviation) in the last two digits. The density is , the size of the cubic unit cell is , and there are 8 atoms per unit cell. Avogadro's number is computed from the equation
From the measured properties and their uncertainties, compute Avogadro's number and its uncertainty.
To find the uncertainty of use the function in Table 3-1.
Describe a volumetric dilution procedure that would be more precise than using amicropipette and avolumetric flask. What would be the relative uncertainty in the dilution?
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.
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.
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