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- Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample. The stated should be 104.5, how??Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample.Describe the preparation of 1100 mL of 6.00 M HNO, from the commercial reagent that is 91% HNO;(w/w) and has a specific gravity of 2.11.
- When a Vitamin C (ascorbic acid; MM = 176.12 g mol-1) tablet is crushed, dissolved and titrated with 0.0340 M KIO3(aq) to a purple/blue endpoint (given by a starch indicator), the volume of KIO3 used is 29.80 mL. If 60 mg of ascorbic acid is the recommended dietary allowance (i.e., 100% of the RDA), then what is the % RDA for the Vitamin C in the tablet? KIO3(aq) + 5 KI + 6 H+ → 3 I2(aq) + 3 H2O I2 (aq) + ascorbic acid → 2 I- + dehydroascorbic acidA mixture contains Na2CO3, NaOH and inert matter. A sample weighing 1.500 g requires 28.85 ml of 0.500N HCI to reach a phenolphthalein endpoint, and an additional 23.85 to reach a methyl orange endpoint.What are the percentages of Na2C03 and NaOH?Stock phosphoric acid solution is 85% H3PO4 and has a specific gravity of 1.70 . Hence, the molarity of H3PO4 solution that is prepared by diluting 15.0 mL aliquot of H3PO4 stock solution to 135 mL H2O is?
- Give the molar concentration of HCl with a specific gravity of 1.18 and has 37.0 % (w/w) purity. (Atomic mass: H = 1.01 amu; Cl = 35.45 amu)115 milliliters are required to prepare 900 ml of 2.00 M H2SO4 (98.1g/mol) from the commercial reagent that is 96.5% (w/w) H2SO4. What is the specific gravity of the commercial reagent? Please fill in the space with a numerical value with two digits, without any unit الجوابYou are required to prepare 5 L of a solution containing 1.000 x 103 mol/L of Cu2"(aq). Which of the following procedures would produce an appropriate solution? O Dissolve 0.0636 g of copper metal in nitric acid, add to a 5.000 Lvolumetric flask, dilute to the mark with deionized water and mix well. O Dissolve 1.248 g of CuSO.5H,0(s) in deionized water, add to a 5.000 L volumetric flask, dilute to the mark with deionized water and mix well. Dissolve 0.250 g of CUSO,.5H,O(s) in deionized water, add to a 5.000 L volumetric flask, dilute to the mark with deionized water and mix well.
- Q1 // show by calculation how could you prepare 500 ml of 0.3N H3PO4 from its concentrated solution has density of 1.71 and percentage of acid equal 86% (w /w) ? Q2// Describe the preparation of 250ml of 0.3 M NAHCO3 ? A.W. H=1 P=31 0=16 C=12 Na=23Preparation of 100 ml 1.0 molar (1.0M) H2SO4 solution (specific gravity, 1.8 g/ml and purity, 98%). H2SO4 molecular weight is 98 grams.How much amount of solids (in grams) do you need to prepare the following solutions? 1. 500.0 mL 0.1000 M stock EDTA solutiona. Weigh an appropriate amount of Na2H2EDTA2H2O (FW=372.24) to the nearest 0.1 mg 2. 100.0 mL 0.0500 M stock Ca2+ solutiona. Weigh appropriate amount of pure CaCO3 (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker.