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Chapter 27: Q5P (page 767)
Why are many ionic precipitates washed with electrolyte solution instead of pure water?
The Ionic precipitates are washed with electrolyte solution instead of pure water because it keeps the electric double layer preserved.
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Determination of sulfur by combustion analysis produces a mixture of and that can be passed through to convert both into , which is titrated with standard base. When 6.123m g of a substance were burned, the required 3.01mL of0.010576MNaOHfor titration. Find wt% sulfur in the sample.
Consider a mixture of the two solids,
, in an unknown ratio. (The notation means that a crystal is formed with two water molecules for each ) When the unknown is heated to for 1h, the water of crystallization is driven off:
A sample originally weighing 1.7839 g weighed 1.5623 g after heating. Calculate the weight percent Ba,K and Cl ofin the original sample.
Explain how the quartz crystal microbalance at the opening of Chapter 2 measures small masses
When the high-temperarure supercondactor yttrium barium copper oxide (see Chapter 16 opening and Box 16-3) is heated under flowing , the solid remaining at is a mixture of , BaO, and Cu . The starting material has the formula
, in which the oxygea stoichiometry varies between 7 and role="math" localid="1663686755590" .
(a) Thennogruimetric analysis. When of were subjected to this andysis, 31.661mg of solid remained after heating to Find the value of x in
(b) Propagation of error. Suppowe that the uncertainty in each mass in part (a) is . Find the uncertainty in the value of x.
Propagation of error. A mixture containing only silver nitrate and mercurous nitrate was dissolved in water and treated with excess sodium cobalticyanide, to precipitate both cobalticyanide salts:
(a) The unknown weighed 0.4321g and the product weighed 0.4515g. Find wt% in the unknown. Caution: Keep all the digits in your calculator or else serious rounding errors may occur. Do not round off until the end.
(b) Even a skilled analyst is not likely to have less than a 0.3% error in isolating the precipitate. Suppose that thege is negligible error in all quantities, except the mass of product, which has an uncertainty of0.30%. Calculate the relative uncertainty in the mass of in the unknown.
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