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- You are tasked with creating a simplified pourboiux diagram of silicia speciation. The relevent reactions are HSO4- <-> SO42- , H2S <-> HS-, and S <-> H2S. The delta G of S is 0, HSO4- = -755.3, SO42- -744.0, H2S = -27.7, HS- = 12.2 The silica activity is 10^-3 M. Set and solve the reactions so they can be graphed on a pe/pH diagram.As part of an investigation on Pb in biological ecosystems, some grasses that grew along the road and were exposed to emissions from motor gasoline were collected. 6.2501 g of grass were calcined to destroy all organic matter, the inorganic residue was properly treated and finally made up to 100 mL. An aliquot of 50 mL of this solution was read in an atomic absorption spectrophotometer registering an absorbance of 0.1250; then 0.10 mL of a standard solution of 55 µg of Pb / mL were added to the other 50 mL, with this fortified sample, another absorbance measurement was made, which was 0.1798. Calculate the µg of Pb / g of grassA 0.1017-g sample of KBrO3 (MW = 167 g/mole) was dissolved in dilute HCl and treated with an unmeasured excess of KI. The liberated iodine required 39.75 mL of a sodium thiosulfate solution. Calculate the molar concentration of the Na2S2O3. BrO3 - + 6I + 6HCl → Br - + 3I2 + 6KCl + 3H2O I2 + Na2S2O3 → 2NaI + Na2S4O6 The type of redox titration reaction is ___. a. iodimetry b. bromination c. iodometry d. diazotination The role of KBrO3 in the titration is ___. a. reducing agent b. oxidizing agent c. source of Br2 d. source of I2 At the endpoint of titration, the equivalence of sodium thiosulfate is equal to the following, EXCEPT ___ . a. equivalence of KI b. equivalence of liberated I2 c. equivalence of KBrO3 d. none of the other choices
- A cobalt(II) salt was dissolved in water and reacted with excess acetylacetone (1,2-pentanedione, CH3 COCHCOCH3 ) and hydrogen peroxide. A green solid was formed that gave the following results for elemental analysis: C, 50.4 per cent; H, 6.2 per cent; Co, 16.5 per cent (all by mass). Determine the ratio of cobalt to acetylacetonate ion in the product.A newly synthesized drug was found to have a carboxyl group, an imide and a sulfonamide group. The first type of method to consider in this drug molecule’s quantitatve analysis is: a. Non-aqueous Alkalimetryb. Non-aqueous Acidimetryc. Aqueous Alklaimetryd. Aqueous AcidimetryA 0.9056 g sample of KBrO3 (MM=167.0) was dissolved in dilute HCl and treated with an unmeasured excess of KI. The liberated iodine required 37.21 mL of Na2S2O3. Calculate the molar concentration of sodium thiosulfate. 1 mol BrO3- = 3 mol I2 = 6 mol S2O32- 0.8744 M 2.623 M 0.8791 M 0.2915 M
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