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Suppose you want to measure the iron content of a sample of water run-off. A 25.0 mL sample was acidified with nitric acid and then treated with excess KSCN to form a red complex that can be analyzed with spectroscopy. The solution was then diluted to 100.0 mL and placed in a cuvet with a path length of 2.48 cm. For comparison, a 10.0 mL reference sample of 6.80 x 10-4 M Fe3+ was also treated with nitric acid and KSCN and diluted to 50.0 mL and placed in a cuvet with a 1.00 cm path length. If both solutions gave the same abs value, what was the concentration of iron in the water run-off sample?The answer should be: 2.19 x 10^-4 M
assuming the volumes of all gases in the reaction are measured at the same temperature and pressure calculate the
Draw a Newman structure for meso-3-4-dibromolhexane. Show how to prepare 3-pentanol from ethyne
Question- Potassium permanaganate and chromic acid can both be used as classification tests for alcohols. Methanol and two amino acids are the hydrolysis products of aspartame.
A metal has denisty 6.4g/cm3 is dropped into water upto 90.6ml the water rise 121.4 ml compute mass of metal
Arginine is very soluble in water; but isoleucine is much less soluble in water. In two or three sentences, explain this difference in solubility. Determine a pI for arginine and isoleucine.
A 21.496 g sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. when the products are treated with water, 2.813 g of gaseous ammonia are generated.
when dr. farrell was a graduate student he once made up a ph 8.0 sodium acetate buffer. why would the casual observer
a metal sulfide, M2(CO3)3, has a Ksp of 4.15 x 10^-42. What is the molar solubility of this sulfide in water? Assume the sulfide dissolves ideally (ignore hydrolysis effects).
Calculate the theoretical yield when 7.0 ml of acetic anhydride
You set off from the bottom of the pile in a space craft that can travel at the speed of light (3.00 x 10^8 m/s). How long, in years, will it take you to reach the top of the pile of pennies? Show all work.
What would be the relative standard deviation in the molarity of the base if the standard deviation in the measurement of mass in a.) is .002g and this uncertainty limits the precision of calculation?
Make the compounds listed from an alkyl halide having four carbons or less, with no functional groups but it can be branched, or cyclohexane, cyclopentane, or ehylene oxide.
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