Chemistry, 03.03.2020 04:55 chrisroman152
Total salt experiment: Inorganic cations can be quantified by passing a salt solution through a cation-exchange column in the H form and titrating the released H with strong base. The moles of OH titrant equal the equivalents of cation charge in solution.(a) What volume of 0.023 1 M NaOH is needed to titrate the eluate when 10.00 mL of 0.045 8 M KNO3 have been loaded on a cation exchange column in the H (b) A 0.269 2 g sample of unknown salt is dissolved in deionized water and loaded onto a cation exchange column in the H The column is rinsed with deionized water and the combined load- form? form ing and rinse solutions are titrated with 0.139 6 M KOH. A volume of 30.64 mL is required to reach the endpoint. How many equiva- lents of cation are in the sample? Find the milliequivalents of cation per gram of sample (meq/g). (c) The mass of substance containing one equivalent is called the equivalent mass. If the cation has a +1 charge, the equivalent mass equals the molar mass. If the cation has a +2 charge, the equivalent mass is half the molar mass. What is the equivalent mass of the sample in (b)?
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Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.
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Total salt experiment: Inorganic cations can be quantified by passing a salt solution through a cati...
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