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The presence of iron ions in drinking water can cause discoloration of the water, a change in taste, darkening of prepared foods, and, in some cases health problems. A slow and uniform precipitation of iron, as Fe(OH)3 can be used as a gravimetric analysis technique. This can be facilitated when the precipitating OH- is generated within the solution using urea decomposition: H2NCONH + H2O CO2 + 2 NH3 The NH3 generated converts to OH- via this reaction: H2O + NH3 NH4+ + OH-
(A) A solution containing 1.80 x 10-3 M Fe3+ is treated with urea to precipitate the Fe3+ as Fe(OH)3. What molarity of urea is needed to precipitate the iron if a 30% excess of urea is desired? ______ M urea
(B) The Fe(OH)3 produced by the process described above is gelatinous so is ignited to convert it to Fe2O3. What is the percent of iron in a solution if 100.0 grams of the solution yielded, upon proper treatment, 0.715 grams of Fe2O3? Note first determine the gravimetric factor for this precipitation.
Gravimetric factor = _______
Mass percent Fe = _______%
The gas plus vapor at its equilibrium partial pressure leaves the liquid at the same temperature and pressure. If 6.550 g of acetone has evaporated, what is the vapor pressure of acetone at 25 degrees Celsius?
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The Kb for an amine is 6.5x10-5. Explain what percentage of the amine are protons red if the pH of a solution of the amine is 9.725. Presume that all OH- came from the reaction of B with H2O)
A solution is created by adding 0.05 moles of H2CO3 (3.1 g, total mass) to 5-L of water, resulting in a pH of 4.2. Now, we add sodium hydroxide (NaOH, strong base) until the pH reaches 7. You can neglect any changes in volume. What is the alkalini..
A 5.0 dm3 sample of oxygen at a pressure of 200kPa and 2.0dm3 sample of nitrogen at a pressure of 500kPa are introduced into a 2.5dm3 vessel.
What is chemical and physical properties and uses of acid halides and acid anhydrides
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