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Give the mechanism and product of the following reaction
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- The concentration of methylene blue in the sample is estimated through (select the correct) options: refractive index measurement (refractometry). turbidity measurement (turbidimetry). absorbance measurement (spectrophotometry). titration with 2% HCl solution.Kindly answer question i, ii & iiichemhelp7 The researcher determined the Pb content of water sample from a river suspected to be contaminated with Pb from a nearby factory by complexing with cyanidine and the absorbance measured was 0.405. What is the lead content of the water sample? a. 4.23 ppm b. 4.28 ppm c. 207 ppm d. 333 ppm