1. A 0.4126-g sample of primary-standard Na2CO3 was treated with 40.00 mL of dilute perchloric acid. The solution was boiled to remove CO2, following which the excess HClO4 was back-titrated with 9.20 mL of dilute NaOH. In a separate experiment, it was established that 26.93 mL of the HClO4 neutralized the NaOH in a 25.00-mL portion. Calculate the molarities of the HClO4 and NaOH.
1. A 0.4126-g sample of primary-standard Na2CO3 was treated with 40.00 mL of dilute perchloric acid. The solution was boiled to remove CO2, following which the excess HClO4 was back-titrated with 9.20 mL of dilute NaOH. In a separate experiment, it was established that 26.93 mL of the HClO4 neutralized the NaOH in a 25.00-mL portion.
Calculate the molarities of the HClO4 and NaOH.
2. A 0.5002-g sample that assayed 96.4% Na2SO4 required 48.63 mL of a barium chloride solution.
Reaction: Ba2+ + SO42+ → Ba SO4 (s)
Calculate the analytical molar concentration of BaCl2 in the solution.
3. A solution was prepared by dissolving 367 mg of K3Fe(CN)6 (329.2 g/mol) in sufficient water to give 750.0 mL.
Calculate:
(a) the molar analytical concentration of K3Fe(CN)6.
(b) the molar concentration of K+.
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