157. To determine sodium in wastewater from a soda plant, a sample of volume V1 was taken, then evaporated to V2, and sodium was determined by the comparison method. The intensity of the standard sodium solution with a concentration of pst was equal to Ist, and the intensity of the analyzed solution was Ix. Determine the concentration of sodium in the wastewater (mg/l)
V1 V1 pst, mg/l Ist Ix
500 50 7.5 30 36

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