A spectrophotometric method for the analysis of iron has a linear calibration cu

Question

A spectrophotometric method for the analysis of iron has a linear calibration curve for standards of 0.00, 5.00, 10.00, 15.00, and 20.00 mg Fe/L. An iron ore sample that is 40–60% w/w is to be analyzed by this method. An approximately 0.5-g sample is taken, dissolved in a minimum of concentrated HCl, and diluted to 1 L in a volumetric flask using distilled water. A 5.00 mL aliquot is removed with a pipet. To what volume—10, 25, 50, 100, 250, 500, or 1000 mL—should it be diluted to minimize the uncertainty in the analysis? Explain

Explanation / Answer

Sol: By pipetout 5 mi solution and is diluted lower volume that is 10 ml and to minimize the uncerrtainity in the analysis.because,if it is diluted to higher solution the change in concentration is very high.

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