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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-1) What amperage is required to plate out 0.250 mol Cr from a Cr3+ solution in a period of 8.00 h?Percentage purity of a sample of 0.1350 g of As2O3 assayed iodometrically using 23.5 mL of 0.1055N iodine solution
- 1. Describe the preparation of (a) 500 mL of 0.0750 M AgNO3from the solid reagent .(b) 1.00 L of 0.285 M HCl, starting with a 6.00 M solution of the reagent. (c) 400 mL of a solution that is 0.0810 M in K+, starting with solid K4Fe(CN)6. (d) 600 mL of 3.00% (w/v) aqueous BaCl2from a 0.400 M BaCl2solution. (e) 2.00 L of 0.120 M HClO4from the commercial reagent [71.0% HClO4(w/w), specificgravity1.67]. (f) 9.00 L of a solution that is 60.0 ppm in Na+, starting with solid Na2SO4 EXPLAIN EACH ITEM1. Describe the preparation of (a) 500 mL of 0.0750 M AgNO3from the solid reagent .(b) 1.00 L of 0.285 M HCl, starting with a 6.00 M solution of the reagent. (c) 400 mL of a solution that is 0.0810 M in K+, starting with solid K4Fe(CN)6. (d) 600 mL of 3.00% (w/v) aqueous BaCl2from a 0.400 M BaCl2solution. (e) 2.00 L of 0.120 M HClO4from the commercial reagent [71.0% HClO4(w/w), specificgravity1.67]. (f) 9.00 L of a solution that is 60.0 ppm in Na+, starting with solid Na2SO4Describe the preparation of 750 mL of 5.30 M H3PO4 from the commercial reagent that is 86% H3PO4 (w/w) and has a specific gravity of 1.71. Take ? mL the concentrated reagent and dilute to ? mL with water.
- How many milliliters of 1.5% alcoholic dimethylglyoxime should be used to provide a36.0% excess with 0.6984 q of steel containing 2.95 wt% Ni? Assume that the densityof the dimethylglyoxime solution is 0.790 g/mL. a. How much Ni sample is present? b. How many moles Ni is present in the sample? c. How much DMG is present?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 = 0.2500g12.1 g of goztic acid was dissolved in water weighing 87.9 G. The mass fraction (%) of acid in the solution was calculated.
- An impure sample of Na3PO3 weighing 0.1 g is dissolved in 35 mL of water. A solution containing 45 mL of 3% w/v HgCl2, 30 mL of 10% w/v sodium acetate, and 10 mL of glacial acetic acid is then prepared. After digesting, filtering, and rinsing the precipitate, 0.2857 g of Hg2Cl2 is obtained. Report the purity of the original sample as % w/w Na3PO3.Describe how you would prepare 1litre of 150ppm Cu2+ using Cu metalCaustic potash that has been exposed to air is found on analysis to contain 90.00% KOH, 2.38% K2CO3 and 7.62% H2O. What weight of residue will be obtained if 1.00 g of this sample is added to 46.00 mL of 1.00 N HCl and the resulting solution, after neutralization with 1.070N KOH is evaporated to dryness?
