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Question- A graduate student wishes to improve the precision of a new drug assay. This student finds that one method of sample preparation gives a measured concentration of 1.025 ±0.0020 x 10-6 M (single standard deviation) for five replicate measurements of the drug. A second method gives 1.017 ±0.011 x 10-6 M (single standard deviation) for five replicate measurements of the drug. Was there any significant improvement in the precision in going from one approach to the other when these results are compared at the 95% confidence level?
How do I yet start setting this up? Thank you
Magnesium can be obtained by precipitating Mg^2+ as Mg(OH)2(s). The Ksp of Mg(OH)2 is 6.0*10^-10. The magnesium ion concentration is 0.059M. If a sample of solution is treated so its [OH-] concentration is maintained at 2.0*10^-3M
Problem- A 0.093 M solution of a weak monoprotic acid is 2.2% ionized at 25 degrees C. What is the acid-ionization constant, Ka, for this acid
If a wheelchair-marathon racer moving at 13.3 miles per hour expends energy at a rate of 635 Calories per hour, how much energy in Calories would be required to complete a marathon race (26.2 miles) at this pace
explain the interaction effect between nitrogen and phosphorus and nitrogen and potassium. describe the dynamics amoung
a sample of nitrogen gas is collected over water at a temperature of 20 degrees celcius and a pressure of 1.00 atm. the
a 10.4-g sample of cacl2 is dissolved in 118 g of water with both substances at 25.0degc. calculate the final
What type of transport is used to take up the ribose in I. facto and in your answer,explain all the data. What is the source of energy for the transport of the ribose?
If the density of ocean water at a depth of 10,000 m is 1.071 g/ml and if 29 g of water at that depth contains 184 mg of potassium chloride, what is the molarity of potassium chloride in the sample
A concentration cell has the same kinds of half-cells, for example Cu?CuSO4(aq), but has a nonzero emf due to differences in CuSO4 molalities. Explain how it is possible for the galvanic cell Cu(s)?CuSO4(aq)?Cu(s), that contains only one CuSO4 sol..
concentrated aqueous hydrochloric acid, the major product obtained was 4-chloro-3,4-dimethyl-2-phenylhexane. Show the mechanism for this reaction.
The crude product is expected to contain a few biphenyl along with benzoic acid. If you were to record the melting point of the crude product, explain how is it likely to compare with that of pure benzoic acid.
Question- Construct a rough plot of pH versus volume of added base for the titration of 50 mL of 0.055 M HCN with 0.075 M NaOH. Ka = 4.0*10-10 for HCN.
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