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A 136.6 mg sample of a crushed Vitamin C tablet was dissolved in 40 mL of H2SO4 and 20 mL of water. 2 grams of KI and 25.00 mL of 0.0155 M KIO3 solution was added, and the mixture was titrated to a starch endpoint. The titration required 20.34 mL of 0.0491 M thiosulfate solution.Calculate the weight percent of ascorbic acid in a tablet of Vitamin C.
The standard change in free energy at 122oC is -6.001 kJ for the reaction A(s) + 2 B(g) ? AB2(g) We prepare a mixture at 122oC in a sealed 3.020 L vessel to contain 0.0370 mol A, 0.509 atm B, and 0.344 atm AB2. What is the free energy change (kJ) ..
ch2 ch2 reacts with hydrogen gas to give ch3ch3 you need to estimate the heat released when bond enthalpies are h h
In an equilibrium mixture the partial pressures of SO 2 and O 2 are 0.125atm and 0.460atm , respectively. What is the equilibrium partial pressure of SO 3 in the mixture?
Consider the standard cell at 25C based on the following half-reactions. Pb^2+ + 2e^- --> Pb E=-0.13V Zn^2+ + 2e^- --> Zn E=-0.76V To the standard cell, OH-, is added to the zinc compartment causing precipitation of Zn(OH)2. After precipitation is..
a. On the basis of your intuitive understanding of the chemical properties of sodium and gold, where in your activity series would you place sodium and gold? b. Will hydrochloric acid react with gold metal to produce gold (III) ions and hyrdogen g..
silver has two naturally occurring isotopes. find the percent abundances of 107ag and 109ag given the atomic mass of
The Kow for carbon tetrachloride is 220. Using the rule of thumb that log(Koc) = .8*log(Kow), and assuming an organic carbon content of 1% you can estimate the retardation factor for carbon tetrachloride.
In a qualitative analysis procedure, a chemist adds HCl to an unknown group of ions and then saturates the solution with H2S so that the solution is 0.1 M in HCl and 0.10 M in H2S. (a) What is the [HS -] of the solution
How do you write orbital diagrams in an a (arrow diagrams) for the following elements: 26Fe, 34Se, 36Kr I d
For the reaction, Hg(aq) + 4I(aq) ? HgI4(aq), the overall formation constant of HgI4 is 1.0 x 10^30. What is the equilibrium concentration of Hg in 500.0 mL of a solution that was initially 0.01 M Hg after the addition of 65 g of KI (FW =166.0 g m..
What is the value of Ksp for Ag2SO4 if 5.40 g is soluble in 1.00 L of water?
Calculate the concentration of HY3- in a solution prepared by mixing 10.00mL of .010M VOSO4, 9.9mL of .010M EDTA and 10.00mL of buffer with a ph of 4.00
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