The sulfur from 4.00g steel is evolved as dihydrogen sulfide gas and titrated with 1.60 mL of 0.05OON iodine solution. How many milliliters if iodine will be reduced by 40.00 mL of Na2S2O3 solution of which 1mL thiosulfate solution = 0.006354g Cu?
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- 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 = 0.2500gA 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 (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?
- An aqueous magnesium chloride solution is made by dissolving 5.60 moles of MgCh in sufficient water so that the final volume g of the solution is 2.70 L. Calculate the molarily of the MECh solution.A student prepares a stock solution of BaF2 by dissolving 50.00g of a BaF2 in 1.00L of water. An additional 2 drops of 37% (w/v) HCl was added to acidify the solution. How many mL of the stock solution will be transferred to preparea 100.00 mL solution with 0.10 M BaF2 solution?A sample of pyrolusite weighing 0.6000 g is dissolved in a solution containing 5.00mL of 6.00 N H2SO4 and 0.900 g of H2C2O4.2H2O. The excess oxalate then requires24.00 mL of KMnO4 solution for titration. If each mL of the KMnO4 will oxidize the Fe(II)in 0.03058 g FeSO4.7H2O, what is the oxidizing power of the sample in terms of MnO2?84.33%
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- A 600.0 mg sample consisting of only CaC2O4and Mg C2O4is heated at 500oC converting the two salts to CaCO3and MgCO3. The sample weighs 465.0 mg. If the sample had been heated at 900oC where the products are CaO and MgO, what would the mixture of oxides weigh? Write in a padpaper and show the clear and complete solution29. 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 sample of pyrolusite weighing 0.6000 g is dissolved in a solution containing 5.00 mL of 6.00 N H2SO4 and 0.900 g of H2C2O4 .2H2O. The excess oxalate then requires 24.00 mL of KMnO4 solution for titration. If each mL of the KMnO4 will oxidize the Fe(II) in 0.03058 g FeSO4 .7H2O, what is the oxidizing power of the sample in terms of MnO2?