140. Solving a chemistry problem

140. Solving a chemistry problem

66. To determine the content of lead impurities in metallic aluminum, a weighed portion of the last mass m g was dissolved, transferred to a 50 ml volumetric flask and brought up to the mark with water. When the polarogram of the resulting solution was taken, the wave height turned out to be equal to hX. The following results were obtained by polarography of standard copper solutions - Table 18.
CPb, μg / ml 0.5 1.0 1.5 2.0 2.5
h, mm 4.0 8.0 12.0 16.0 20.0 13
Build a calibration graph and determine the percentage of lead in the analyzed sample for the following task numbers - Table 19.
m, g 5.134
hx, mm 9.0

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