7 jobs in analytical chemistry (K / P 2, Var 7 MGTA)

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Uploaded: 11.10.2012
Content: 21011205528993.pdf (457,67 kB)


Task №7
What kind of experimental error do you know? What caused the error and how to troubleshoot various kinds?

Task №17.
The sample containing 1.2456 g of sodium dissolved in 100 ml flask and assayed using the line of sodium (590 nm) by atomic fluorescence. To determine the sodium content in the sample (mg / l). The results are summarized in the table:
Parameters Standard sample solution
1 2 3 4 5
CNA, mg / l 0.5 1.0 2.0 2.5 4.0
The emission of fluorescence 24 49 103 120 190 121

Task №27.
Calculate the molar refraction bromoform SHBr3.

Task №37.
When the photometric determination titanium chromotropic acid solution containing 11.496 g of titanium in 10 ml cuvette with a layer thickness
2 cm was obtained optical density equal to 0.245. Determine the molar-coefficient repayment colored compound.

Task №47.
Calculate the potential at the titration of 0.0100 n. 0.1000 N solution of formic acid. KOH solution at the equivalence point. Quinhydrone indicator electrode; (Us. TBE) .elektrod comparison saturated calomel electrode temperature of 30 C.

Task №57.
Determine the current in the cell containing 0.1N. sodium nitrate solution, with the electrodes of 2.0 cm2 area, spaced 10 mm if applied voltage is 6.25 V and equivalent conductivity of 200 cm2 / Ohm-eq.

Task №67.
When determining ethyl alcohol by gas chromatography were prepared following peaks according to the content:
C, mg 0.2 0.4 0.6 0.8 1.0
h, mm 18 36 48 66 83
To 0.02 ml of the solution obtained by a peak height of 57 mm. To determine the alcohol content of the test solution (%) when the specific gravity of the solution
0.95 g / cm3.

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