Sulfuric acid diluting stock solution

Standard Preparations Dissolve 338.5 mg of mercuric chloride, in about 200 mL of water in a 250-mL volumetric flask, add 14 mL of 1 2 sulfuric acid, dilute to volume with water, and mix. Pipet 10.0 mL of this solution into a 1000-mL volumetric flask containing about 800 mL of water and 56 mL of 1 2 sulfuric acid, dilute to volume with water, and mix. Pipet 10.0 mL of the second solution into a second 1000-mL volumetric flask containing 800 mL of water and 56 mL of 1 2 sulfuric acid, dilute to volume with water, and mix. Each milliliter of this diluted stock solution contains 0.1 pig of mercury. Pipet 1.25, 2.50, 5.00, 7.50, and 10.00 mL of the last solution (equivalent to 0.125, 0.250, 0.500, 0.750, and 1.00 ptg of mercury, respectively) into five separate 150-mL beakers. Add 25 mL of aqua regia to each beaker, cover with watch glasses, heat just to boiling, simmer for about 5 min, and cool to room temperature. Transfer the solutions into separate 250-mL volumetric flasks, dilute to volume with water, and mix. Transfer a 50.0-mL aliquot from each solution into five separate 150-mL beakers, and add 1.0 mL of 1 5 sulfuric acid and 1.0 mL of a filtered solution of 1 25 potassium permanganate solution to each. Heat the solutions just to boiling, simmer for about 5 min, and cool. 

G.14 The sulfuric acid solution that is purchased for a stockroom has a molarity of 17.8 M all sulfuric acid solutions for experiments are prepared by dilution of this stock solution, (a) Determine the volume of 17.8 M H2S04 that must be diluted to 250 mL to prepare a... 

Standard Preparation Prepare the stock solution and the dilutions, as directed in the test, to obtain a solution containing 1 xg of mercury per milliliter. Transfer 1.0 mL of the final solution (1 xg of mercury) into a 50-mL beaker, and add 20 mL of water, 1 mL of 1 5 sulfuric acid, and 1 mL of a 1 25 solution of potassium permanganate. Cover the beaker with a watch glass, boil for a few seconds, and cool. 

Mercury Stock Solution Transfer 135.4 mg of mercuric chloride, accurately weighed, into a 100-mL volumetric flask, dissolve in and dilute to volume with 1 A sulfuric acid, and mix. Dilute 5.0 mL of this solution to 500.0 mL with 1 A sulfuric acid. Each milliliter contains the equivalent of 10 pig of mercury. 

FOLLOW-UP PROBLEM 3.14 To prepare a fertilizer, an engineer dilutes a stock solution of sulfuric acid by adding 25.0 m of 7.50 M acid to enough water to make 500. m. What is the mass (in g) of sulfuric acid per milliliter of the diluted solution ... 

The Erlenmeyer flask is charged with 100 mL of the 1.0 M stock solution of K[C2B9H12] (see this volume, Chapter 5, Section 53) and 31.2 g (0.4 mole) of dimethyl sulfoxide. While the solution is being stirred, 100 mL of concentrated sulfuric acid is added dropwise over a 1-hr period. Stirring is continued for an additional 5 hr. The resultant two-layer mixture is then set aside overnight. After dilution with 500 mL of cold water, the mixture is vacuum filtered, to isolate the solid residue, and this is washed with two 100-mL portions of water and recrystallized from 80% methanol. White needles separate which are isolated by vaccum filtration and dried in air at ambient temperature for 8 hr. The yield is 10.8 g (55.6%). 

III. Standards made from stock solution No. 3 are diluted the same as I except that 1 ml. of sulfuric acid is used instead of the 1 ml. of hydrochloric acid. 

Standard solutions ammonium-nitrogen standard series of 5, 10, 20, 30, 40, SO mg prepared by dilution of 1000 mg 1 NH4-N stock solution with water in SO ml volumetric flasks containing 6 ml of concentrated sulfuric acid. 

Solution B is prepared by placing 29 g of potassium iodate (KIO3) (26 g of NalOs can be substituted) and about 400 mL of distilled water in a 1-L beaker. Add 8.6 mL of 6.0 M H2SO4. (To prepare a stock solution of 6.0 M sulfuric acid, carefully pour 330 mL of concentrated [18 M] sulfuric acid into 500 mL of distilled water and dilute to 1.0 L.) Stir the solution until the iodate dissolves (this may require some heating—sodium iodate will dissolve more readily). 

The oxide is then packed and sold, or metered into water to form a slurry suitable for dissolving in acid. Sulfuric acid (50 %) is preferred, as the heat of solution is not too violent. In this way, a strong stock solution of about 300 g/L Cd can be produced. The solution is treated as necessary to remove other undesirable metal contaminants, filtered and diluted down to the required strength prior to precipitation. 

Stock standard phosphorus solution, dissolve 4.393 g of dried AnalaR potassium dihydrogen phosphate (KH2PO4) in 150 ml of 1 10 sulfuric acid and dilute to 1 litre with water (1.0 mg/ml phosphorus). From this prepare solutions containing 0.01 mg P/ml and 0.001 mg P/ml. 

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