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As part of a soil analysis on a plot of land, Find out the ammonium content using gravimetric analysis with sodium tetraphenylborate, Na B(C6H5)4-. Unfortunately, the amount of potassium, which as well precipitates with sodium tetraphenylborate, is non-negligible, as well as must be accounted for in the analysis. Presume that all potassium in the soil is present as K2CO3, as well as all ammonium is present as NH4Cl. A 4.975-g soil sample was dissolved to give 0.500 L of solution. A 100.0-mL aliquot was acidified as well as excess sodium tetraphenylborate was added to precipitate both K and NH4 ions completely. The resulting precipitate amounted to 0.223 g. A new 200.0-mL aliquot of the original solution was made alkaline as well as heated to remove all of the NH4 as NH3. Explain the resulting solution was then acidified as well as excess sodium tetraphenylborate was added to give 0.183 g of precipitate. Determine the mass percentages of NH4Cl and K2CO3 in the original solid.
Consider the decomposition of calcium carbonate. Assume that ?H° = 177.8 kJ/mol and ?S° = 160.5 J/K·mol for the temperature range.
considering the given equations 3cuso4 2fe --gt 3 cu fe2so43 determine the limiting reactant and the numbers of moles
Determine which of them exhibit resonance. (In other words, which of the following molecules exhibit resonance? Note: there is more than one answer and you must choose all of the molecules in the list that exhibit resonance.)
At 30 C, by how mush is a reaction's activation energy decreased by the addition of a catalyst if the catalyst triples the reaction
A 21.40L gas cylinder has been filled with 3.186 moles of gas. You measure the pressure to be 3.260 atm . What is the temperature inside the tank
A sample of gas occupies 2.78 x 103 mL at 25oC and 760 mm Hg. What volume will the gas sample occupy at the same temperature and 475 mm Hg?
At a certain temperature, Kc for the reaction, PCl5 = PCl3 + Cl2, is equal to 3.33. After 0.20 mole of PCl5 and 1.0 mole of PCl are introduced into a 2.00-L evacuated chamber, calculate the equilibrium concentration of PCl5
hours in the presence of a certain concentration of an acid catalyst, what is the half-life for this reaction under the same conditionns? (Rate = k[C12H22O11]
a sample of 4.47 grams of a molecular compound is that dissolved in 96 grams of tetrachloromethane ccl4. the normal
What is the change in pH when 0.005 moles of HCl is added to 0.100 L of a buffer solution that is 0.100 M in CH3CO2H and 0.100 M NaCH3CO2? The Ka for acetic acid is 1.8 x 10 -5.
If 30 mL of 6.2 M H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?
many common weak bases are derivatives of where one or more of the hydrogen atoms have been replaced by another
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