B. Same as Part A, but three determinations are made: Sample 1 Sample 2 Sample 3 mass of sample 0.4892 g 0.3981 g 0.3429 g mass of barium sulfate 0.8462 g 0.6890 g 0.5938 g Find the mass percent SO42- for each sample, the average percent SO42- (mean), and the average deviation from the mean (precision index).
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Answer B, show all work and correct number of sig figs.
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- 1. On the molecular level, what does it mean for a solid sample to be pure? 2. The computed percent recovery was more than 100%. What does this signify, and what should be done about it?30. What weight of impure ferrous ammonium sulfate sample in milligrams must be taken for analysis so that the number of centigrams of BaSO4 will represent five times the % S in the sample? a. 230 mg b. 345 mg c. 460 mg d. 690 mg 31. If 100 mL of a dichromate solution (10 grams K2Cr2O7 per liter), 5 mL of 6 N H₂SO₁ and 75 mL of a ferrous solution (80 grams of FeSO4-7 H₂O per liter) are mixed, and resulting solution titrated with 0.2121 N KMnO4, what volume of is required KMnO4? a. 5.60 mL b. 5.80 mL c. 6.00 mL d. 6.20 mLO d. 83.0 mL e. 139 mL Diluting 1.0 mL of a 1.0 M solution to 1,000 mL results in a solution that is 0.001 M. Repeating this 1,000-fold dilution process five more times results in a concentration of Select one: O a. 1.0 x 108 M. O b. 1.0 x 10-9 M. O c. 1.0 x 10-18 M. Od. 2.0 x 10-4 M. O e. 5.0 x 103 M. Clear my choice In a demonstration of strong electrolytes, weak electrolytes, and nonelectrolytes, Professor Popsnorkle used a lightbulb apparatus that showed how much a solution conducted electricity by the brightness of the lightbulb. When pure water was tested, the bulb did not light. Then Professor Popsnorkle tested Type here to search
- Atomic Wt: 0 15.999 126.904 C 12.011 = As = 74.922 H = 1.008 Preparation and Standardization of 0.1 N lodine Solution Preparation 1. Dissolve 14 g of iodine in a solution of 36 g of potassium iodide in 100 ml of water 2. Add 3 drops of hydrochloric acid and dilute to 1000 mil Standardization Arsenic Trioxide Volume of iodine Normality 1. Weigh 150 mg of arsenic trioxide (As203) and dissolve in 20 ml of 1 N sodium hydroxide by warming if necessary 2. Dilute with 40 ml of water, add 2 drops of methyl orange TS and follow with diluted hydrochloric acid until the yellow color Na = 22.9901 = is changed to pink Add 2 grams of sodium bicarbonate, dilute with 50 ml off water, and add 3 ml of starch TS 4. Slowly titrate the iodine solution into the analyte until a permanent blue color is produced. 5. Calculate the normality. *Volume of iodine which produced the permanent blue color: 30.2 ml Standardization: REACTION As2O3 + 6NaOH → 2Na3AsO3 + 3H₂O Na3ASO3 + 12 + NaHCO3 → Na3AsO4 + Nal + CO₂ +…Part C: Determine percent Oxalic Acid in Unknown Sample Molar mass of oxalic acid 90.03 g/mol Trial 1 Trial 2 Trial 3 Average Precision Mass of unknown oxalic acid (g) 1.0048 0.9995 1.0018 --- Volume (mL) of Standardized KMNO4 used Moles of KMnO4 10.03 9.85 10.45 --- --- --- Moles of oxalic acid (H2C204 • 2H2O) --- --- grams of oxalic acid (H2C204 • 2H2O) (g) percent oxalic acid (%) --- --- Show calculations:What is the H2S content of the solution (in mg/dm3 unit) of which 20 cm3 reacts with 40 mgof Br2.MM[H2S]=34.08 g/mol; MM[Br2]=159.8 g/mol
- * 00 LL CO %23 6. What volume of 0.08892 M HNO3IS required to react completely with 0.2352 g of potassium hydrogen phosphate? HNO3(aq) + K2HPO4(ag)-H3PO4(aq) + KNO3(ag) L Display Settings F4 F5 F7 F8 F10 F11 F12 2$ 4. 5. 9. E R T Y4. Assuming no calculation errors, why would a percent recovery > 100% or a percent recovery < 100% be obtained? Give at least one reason for eachSOLUBILITY CURVES KI 140 130 120 110 100 NONO 90 KNO HCI NH3 70 NH CI 60 KCI 50 40 NaCi- 30 KCIO3 20 O 1O 20 30 40 50 do 7O 80 9o 100 TEMPERATURE C 1. What mass of solute will dissolve in 100 g of water at the following temperatures? a. KNO3 at 70°C b. NaCl at 100°C c. NH&Cl at 90°C d. Which of these 3 substances is most soluble in water at 15°C? %3D GRAMS OF SOLUTE/IO0g MO
- H+ HO HC1 (Excess) OH 1. LiAlH 4 2. H₂O* H₂ Pd/C 1. CH 3MgBr 2. H₂O+What is the minimum distribution ratio (Dc) if 98% of the solute in a 25.0-mL sample in an aqueous solution is extracted using a single 20.0-mL portion of an organic solvent? O A. 61 О В. 98 О С. 39 O D. 99Aktiv Chemistry < + C X b Success Confirmation XM Your Chemistry answe x app.101edu.co Answered: A 0.660 M X b Answered: How many × b Answered: A student X Time's Up! What quantity in moles of NaOH are there in 82.0 mL of 0.300 M NaOH? 1 4 7 +/- 2 5 8 New Tab mol 3 6 9 G 0 x + Submit X C x 100