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Nitrate levels in well water can be determined spectrophotometrically though a procedure that measures the intensity of absorbed light, at 410 nm, after the sample has been properly treated with phenoldisulfonic acid. An unknown sample of 25.0 mL of well water was analyzed, at 410 nm in a 1.00 cm cell, and found to have an absorbance value of 0.721. An identically treated 25.0 mL sample, to which 5.00 mL of 10.0 ppm nitrate concentration was added, provided an absorbance of 0.840. What is the concentration of nitrate in the original sample?
ppm nitrate = ______
Using Beer's Law calculate the value for (extinction coefficient) in units of ppm-1 cm:
= _____ ppm-1 cm
Assuming that the instrument used in this determination could reliably detect absorbance values down to 0.05 (and that no components other than the analyte had any appreciable absorbance) what would be the lower limit of detection?
________ M
Consider a bond with a 4% annual coupon and a face value of $1,000. Complete the following table. Years to Maturity Yield to Maturity Current Price 2 2% 2 4% 3 4% 5 2% 5 6% What relationships do you observe between years to maturity, yield to maturit..
Name and describe three specific utility software tools that you would pick to improve your ability to render general, but effective, user support.
Compute the present value of a $500 investment made 4 months, 7 years, and 15 years from now at 4 percent interest. Instruction: Round your answers to the nearest penny (2 decimal places). Present value of investment made in 4 months at 4 percent = $
an increase in the demand for new housing in Saskatchewan.
there are n ge 3 doctors who have created a partnership. in each period each doctor decides how hard to work. let eti
The market for a standard-sized cardboard container consists of two firms: CompositeBox and Fiberboard. As the manager of CompositeBox, you enjoy a patented technology that permits your company to produce boxes faster and at a lower cost than Fiberbo..
Sketch a graph which shows the lost gains from trade that result from having a monopoly.
More Tech Drilling is considering the sale of its Alaskan subsidiary to another company. The subsidiary is expected to produce profits of $800,000 next year
Congress is considering legislation that will provide additional investment tax credits to existing businesses. Effectively, an investment tax credit reduces the cost to firms using captial in production. Would you expect labor unions to lobby for or..
With meat nutrition and veggie nutrition options, show graphically how a person who ate meat became a vegetarian after reading about the negative health effects of meat. Describe what happened in your graph. Is the person better off after reading abo..
Freemont insurance sells homeowners insurance. In a recent financial review, managers discovered that company performance was lagging behind projections. Does this group have enough information to make a good decision? Suppose adverse selection is at..
A price floor is introduced on a market and creates a deadweight loss. Knowing the market demand curve is P = 100 − 3Q and the market supply curve is P = 20 + Q, find the price floor that will result in a deadweight loss of DWL = 200/9 . (P^f = 50)
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