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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 amount of boiling water required to raise the temperature of 25 kg of water in the bath to body temperature is 4.8 kg. In this process, the heat lost by the boiling water is equal to the heat gained by the room-temperature water.
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What mass of silver was in the original solution? (Assume that all of the silver was precipitated out of solution by the reaction.)
Question- 1. List three ways in which wells in the spot plate could become contaminated, leading to inaccurate results, and discuss how to prevent each.
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F14CIS Chemistry in silico Assignment. In your write up you should: Discuss briefly the conformational freedom of the molecules studied. Include a table of the energies you obtained for each method in each basis set and a table of the CPU times for ..
An optical fiber for something is made SiO2 glass (density = 2.2 Mg/m^3). How many Si atoms and how many O atoms are present per millimeter of length of a fiber 10 µm in diameter
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A 15-gram sample of neon is placed in a sealed container with a constant volume of 8.5 liters. If the temperature of the container is 27ºC, which of the following expressions gives the correct pressure of gas? The ideal gas constant, R, is 0.08 ..
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