One of the main acidic components of acid rain is sulfuric acid, H₂SO4. Assuming sulfuric acid is the only acid in the acid rain, what volume (in mL) of 0.000875 M KOH would be required to titrate a 35.00 mL sample of acid rain with an H₂SO4 concentration of 1.310 x 10-4 M? Volume mL
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- Guanosine (C10H13N5O5) in solution has a maximum absorbance at a wavelength of 275 nm. The molar extinction co-efficient at this wavelength is 84M−1cm−1and the path length is 24.7 cm. Through the use of a spectrophotometer, it is found that the that A275= 1.48. What is the concentration of the guanosine solution in grams/litre? Molecular weights (g/mol): C-12, H-1, N-14, O-16 Select one: A. 0.201869 g/L B. 0.435188 g/L C. 0.059919 g/L D. 0.294046 g/L E. 0.000713 g/LYou record the absorbance of your unknown BSA sample at 0.276. What is the concentration in ug/mL of the unknown assuming you have a standard curve with the line of best fit with y=0.0001x+0.0038 as its equationAn analysis done on total Mn2+ of an industrial effluent is found to be 8.5 mmol L-1. The effluent will be discharged in a lake of 15 mg L-1 fulvic acid (FA) content. What is the fraction of FA expected to bind to Manganese at pH-5. Assume that Mn2+ is the only cation present in Water Lake and that its concentration is 1/10th of that of the effluent after being diluted in the lake. Binding sites of FA = 4.5 mmol g -1 and K'f (MnFA) at pH 5 = 5.0 x 10^3 Select one: A. 0.51 B.51% C. None of the suggested answers D. 0.62 E.81%
- Calculate pNF concentration in each cuvette using Beer-Lambert’s Law. ε = 18,000 M-1 cm-1; b = 2.00 cm Cuvette 1 pNF 1 mL Water 2 mL Absorbance 0.546A 1.143 g sample contains only vitamin C (C,H, 0,) and sucralose (C,H,Cl, O,). When the sample is dissolved in water to a total volume of 31.7 mL, the osmotic pressure of the solution is 3.91 atm at 285 K. What is the mass percent of vitamin C and sucralose in the sample? vitamin C: sucralose: %Put these aqueous solutions in order of decreasing freezing point 0.1 m NaCl 0.1 m MgCl2 0.1 m CH3OH 0.1 m Na3PO4
- An aqueous solution of 0.2100 g of a mixture containing potassium cyanide and potassium chloride required 14.56 mL of 0.1000 M silver nitrate to produce a faint permanent turbidity; 30.00 mL more of the silver nitrate was added (an excess) and the precipitate of AgCl and AgCN filtered off from the solution. The filtrate and washings were titrated with 13.06 mL 0.1000 M thiocyanate solution. Calculate the percentages of KCl and KCN in the sample. Note: the appearance of faint turbidity indicates the formation of Ag(CN)2-Calculate the pH of a buffer that contains 0.15 M MOPS anionic form and 0.25M MOPS zwitterion. The pKa is 7.2At what pH does a lysine solution exhibit the highest buffering capacity? (Lysine pKas: pk1 = 2.2, pK2 = 8.95, pK3 = 10.5) %3D O рH 12.1 О рH 9.72 O pH 5.67 pH 8.95
- Compare the solubility of lead carbonate in each of the following aqueous solutions: Clear All 0.10 M Pb(CH3C00)2 More soluble than in pure water. 0.10 M (NH4)2CO3 Similar solubility as in pure water. 0.10 Μ KNΟS Less soluble than in pure water. 0.10 Μ ΝΗCH, COOThe strength of ionic interactions is weaker in water than inan anhydrous medium. Explain how water weakens theseinteractions.The glucose content of samples can be determined using Nelson't test. The equation of the line for the standard curve preapred for varying concentrations of glucose is y = 3.0x + 0.2. Based from this information, determine the glucose concentration (in M) of a strawberry preserve having an absorbance reading of 1.35.