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Some of your wines are oxidizing at an alarming rate, so you create an external calibration curve for a spectrophotometric method for iron analysis, for which the linear range is 0.20 - 2.00 mg/L iron. You start by mking 1.00 L of a 200.00 mg/L iron stock solution by dissolving ferrous sulfate heptahydrate (FeSO4•7H2O) in model wine.
a. What mass (mg) of FeSO4•7H2O is required to make this stock solution?
b. What volumes (µL) of the 200.00 mg/L stock must be diluted to create 10.00mL of standards at 0.20, 0.50, 1.00, and 2.00 mg/L iron?
What is the mole fraction of methane in the mixture? (Assume that the water produced by the combustion is in the gaseous state.)
What is the solubility of calcium fluoride in a solution that contains 0.015 M calcium chloride? Note calcium chloride is completely soluble in water.
to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
the decomposition of aqueous hydrogen peroxide to gaseous o2 and water is the first order reaction. if it takes 8.0 h
Which of the following ideal aqueous solutions would be predicted to have the highest vapor pressure. 2.00 m MgBr2
To what volume should you dilute 150 mL of an 8.00 M CuCl_2 solution so that 55.0 mL of the diluted solution contains 5.9 g CuCl_2?
Compound J, C16H16Br2, is optically active. On treatment with strong base, compounds K and L (each C16H14) are formed; K and L each absorb only 2 equivalents of hydrogen when reduced over a Pd/C catalyst. Compound K reacts with ozone to give pheny..
The sedimentation coefficient of a certain DNA in 1 M NaCl at 20 oC was measured by boundary sedimentation at 24,630 rpm. The following data were recorded time (min) distance (cm) 16 6.2687 32 6.3507 48 6.4380 64 6.5174 80 6.6047 96 6.6814 A.
Problem- An ideal solution is formed from a mixture of the nonvolatile solute urea, CO(NH2)2, and methanol, CH3OH. Calculate the mole fraction of urea that is obtained from mixing 6.0 g of urea with 32.0 g of methanol.
A student in lab constructed an Ag+ sensor using the same procedure as in the Metal Ion Sensor lab that you performed. Titration of 10.00 mL of an AgNO3 solution diluted with 40.0 mL of DI water required 11.85 mL
20.00 mL of 0.160 M HC2H3O2 (Ka = 1.8x10-5) is titrated with 0.200 M NaOH. What is the pH of the solution before the titration begins
Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes. Draw the major organic product(s) formed when hex-2-yne undergoes hydration in the presence of HgSO4 and H2SO4.
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