Chemistry, 02.10.2019 20:00 addidas234cs
The following information relates to question 9 below. an unknown quinine bisulfate sample was examined by spectrofluorometric analysis using the following procedure. a quinine bisulfate tablet (label claim 300 mg of quinine bisulfate) was weighed, crushed, and powder equal to one-third of a tablet was dissolved in 1.00 l of 0.1 m sulfuric acid using a volumetric flask. an aliquot of this solution was then diluted 1 in 200 with 0.1 m sulfuric acid so that it was within the range of the standard solutions. the fluorescence intensity (fi) of this diluted sample was recorded at an excitation wavelength of 350 nm and an emission wavelength of 455 nm. 9. if the fluorescence intensity (fi) of the diluted sample is 290.1 and the calibration curve has an equation of y 558x where y is fl and x is the concentration of quinine bisulfate in units of mg/l, what is the weight of quinine bisulfate in the tablet? a) 104 mg b) 1.56 mg c) 0.104 mg d) 529 mg e) 312 mg
Answers: 2
Chemistry, 22.06.2019 03:00
Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.
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Chemistry, 22.06.2019 13:50
Abeaker with 2.00ร102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.
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Chemistry, 22.06.2019 15:40
Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n
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The following information relates to question 9 below. an unknown quinine bisulfate sample was exami...
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