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Phosphoric Acid, Iron in Serum, and pH of a Mixture1.In the laboratory you have prepared various reagents for your experiments. briefly describe the preparation of 3.00 L of 0.150 M H3PO4 from concentrated commercial reagent. This reagent if 86.0% H3PO4 and has a density of 1.84g/mL. The molar mass of H3PO4 is 97.995 g/mol
2. The following data were obtained for the determination of iron in serum by a spectrophotometeic method. Assuming the validity of Beer's Law for the experiment calcualte the concentration of iron in serum..Sample Absorbance at 562 nm in 1.000 cm cellBlank 0.0383.00 µg Fe standard 0.329Serum sample 0.219
3.What pH do you expect if you mix 25.mL of 0.2M NaOH with 50.0 mL of 0.15 M HNO3 and then dilute to 250.0mL in a volumetric flask?
Calculate the percent by mass of calcium carbonate in the rock, assuming that it is the only substance reacting with the HCl solution.
Consider two DNA molecules: one 400 base pairs long, the other 800 base pairs long. Assuming that each is a rigid rod of diameter 25 Å, with a length of 3.4 Å per base pai.
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How many grams of Fe(NO3)3 · 9 H2O are required to prepare 300.0 mL of a 0.249 M solution of Fe(NO3)3 · 9 H2O?
Consider the titration of a 24.0 ml sample of 0.120 M HC2H3O2 with 0.105 M NaOH. Determine the initial pH.
Determine how many grams of aluminum hydroxide will get from 18.2g of aluminum sulfide and determine the density of this newly minted penny
Consider the reaction CuSO4(s) ! CuO(s) + SO3(g) . If G? = -14.6 kJ at 950?C for this reaction, calculate G for an SO3(g) pressure of 50 bar at this temperature.
What volume of .2 M Na2SO4 will completely react with 50 mL of .135 M Ba(NO3)2
What is the boiling point of a solution made using 813g of sucrose, C12H22O11, in 0.275 kg of water,H2O.
Calculate the energy in joules and calories lost when 10.0 gm ethanol, {C_2H_5OH}, cools from 62.5 0C to -46.0 0C?
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