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Percentage purity of a sample of 0.1350 g of As2O3 assayed iodometrically using 23.5 mL of 0.1055N iodine solution
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- A piece of an unknown weighing 12.50is placed in 49.7cm of water in a cylinder. The water level increases to 69.0cm3. whats the calculated value for the drnsity of the solid in g ml-1What mass of solid Lanthanum (III) oxalate nonahydrate { La2 ( C2O4 )3 ∙ 9 H2O } can be obtained from 650 mL of 0.0170 M aqueous solution of LaCl3 by adding a stoichiometric amount of sodium oxalate ? with solution/explanationA 40-mL vial of a sodium chloride was diluted to a liter with sterile water. The concentration (w/v) of NaCl (MW 58.5) in the finished product was 0.58%. What was the concentration in mEq per mL of the original solution?
- What is the percentage of Nickel in an ore if, when analyzed by the cyanide method, 20.00mL of KCN solution (containing 1.00mmol of AgNO3 per milliliter) are used? Wt of sample used = 0.2500g29. How much 0.600 N base must be added to 750 mL of a 0.200 N base in order for the solution to be 0.300 N? 30. Calculate the molarity of KMnO4 (158m04 g/mol) sok standardized against 1.356 grams Na2C2O4 (134 g/mol) requiring 25 mL of the solution in acidic medium?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 and Normality of K3Fe(CN)6. (b) the molar concentration of K+. (c) the molar concentration of Fe(CN)63-. (d) the weight/volume percentage of K3Fe(CN)6.
- 4. a. Describe the preparation of 1.67 L of 5.00% (w/v) K2Cr2O7 from the solid salt. b. What is the ppm K2CR2O7 in the above solution?Write a charge balance for H2SO4 in water.If a 10.0mL volumetric flask is used to prepare the dilution, what volume of 0.50 M cobalt (II) nitrate is needed to prepare a 0.15 M standard solution?
- What mass (in grams) of Na2S2O3 is needed to dissolve 0.44 g of AgBr in a solution volume of 1.0 L, given that Ksp for AgBr is 3.3×10−13 and Kf for [Ag(S2O3)2]3− is 4.7×1013?) What amperage is required to plate out 0.250 mol Cr from a Cr3+ solution in a period of 8.00 h?What is the percentage purity of a sample of impure oxalic acid dihydrate if a sample weighing 0.2003 gram requires 29.30 mL of permanganate solution, of which 1.000 mL ≈ 0.006023 g iron?