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A 3.6g soil sample is treated with HClO4 , and HF is distilled from the mixture. The distillate is collected in an ionic strength buffer and diluted to 50 ml. Measurement with a fluoride ISE gives a value of +95 mV. Exactly 5ml fluoride a standard containing 1×10 -3 M is added to the 50 ml sample, and the potential be comes +68 mV. Calculate fluoride content in the soil sample as percent and parts per million of F - . (A w for F= 19 g/mol).

A 3.6g soil sample is treated with HClO4 , and HF is distilled from the mixture. The distillate is collected in an ionic strength buffer and diluted to 50 ml. Measurement with a fluoride ISE gives a value of +95 mV. Exactly 5ml fluoride a standard containing  1×10 -3 M is added to the 50 ml sample, and the potential be comes +68 mV. Calculate fluoride content in the soil sample as percent and parts per million of F - . (A w for F= 19 g/mol).

Grade:12th pass

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