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E107. When constructing the calibration graph for the d
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Uploaded: 02.02.2021
Content: 107+108.rar 24,39 kB
Uploaded: 02.02.2021
Content: 107+108.rar 24,39 kB
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E107. When constructing the calibration graph for the determination of zinc, a 10-4 M zinc solution was used. An aliquot of which 5 ml was diluted with an ammonia buffer solution to 25 ml and polarized. The following data were obtained:
V, ml 1 2 3 4 5 6
H, ml 9 16 26.5 35 41 54
An alloy mass of 1.0 g containing zinc was dissolved in 250 ml of an acid mixture, 5 ml of the resulting solution was taken and diluted with the same buffer solution to 25 ml. When polarographic obtained a gain of 24.7 mm What is the mass fraction of zinc in the alloy?
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