question archive In preparing calibration standards, a stock solution is typically first prepared, then diluted to different concentrations to produce a series of standards
In preparing calibration standards, a stock solution is typically first prepared, then diluted to different concentrations to produce a series of standards
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In preparing calibration standards, a stock solution is typically first prepared, then diluted to different concentrations to produce a series of standards. For the analysis of SO2, standards at 5, 10, 25, 50, and 100 mg/L SO2 are required. Describe a procedure to first prepare 100 mL of stock solution (1000 mg/L SO2) using solid potassium metabisulfite salt K2S2O5. Then describe how dilutions would be done to produce 100 mL each of the remaining solutions (5, 10, 25, 50 and 100 mg/L) using the 4000 mg/L stock.
- K2S2O5 has a molecular mass of 222.31 g/mol and yields 2 mole SO2 per mole of K2S2O5
- K2S2O5 + H20 -> 2 SO2 + 2 KOH
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