Determine the %w/w of Ca in the original crushed eggshell sample.
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Back titration: The major component of eggshells is calcium carbonate (CaCO3)(CaCO3) . To determine its calcium content, a back titration was done as described. 0.7520 g of dry, crushed eggshell was placed into an Erlenmeyer flask and dissolved with 25.00 mL of 1.026 M HCl according to the following reaction.
CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g)CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g)
To assist with the reaction between the HCl and CaCO3CaCO3 , the solution was heated to a boil, and then left to cool. Once no more CO2(g)CO2(g) was being produced (the bubbling had stopped), approximately 25 mL of deionized water was added to the flask, and its contents were quantitatively transferred to a 100.00 mL volumetric flask. The volumetric flask was filled to the mark with deionized water and mixed. A 25.00 mL aliquot of the diluted CaCO3CaCO3 sample was pipetted into a separate Erlenmeyer flask and titrated with 22.96 mL of standardized 0.1080 M NaOH to the phenolphthalein end point. Determine the %w/w of Ca in the original crushed eggshell sample.
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- You have an initial solution in which you added quantities of “A” and “B” such that there is 4.5 M “A” and 2.5 M “B” and no complex (“AB”) at time 0. After equilibrium, you are able to isolate and quantitate the “AB” complex, and find its concentration is 1.5 M. Given that RT is 0.59 kcal/mol, what is the delta Go’ for the association reaction?Suppose a 500.mL flask is filled with 1.7mol of H2 and 0.20mol of HCl. The following reaction becomes possible: H2(g)+Cl2(g)-->2HCl(g) The equilibrium constant K for this reaction is 4.78 at the temperature of the flask. Calculate the equilibrium molarity of Cl2. Round your answer to two decimal places.1)Ubiquitin is a small protein with a monoisotopic mass of 8560 Da. a) Electrospray ionization of this small protein typically results in major charge states of +8, +9, +10, +11, +12, and +13. Using this information, complete the table below, assuming the charges on each come from protonation. Report mass and m/z values to the ones place. b) Using the data you entered in the table, sketch an expected ESI-MS spectrum for ubiquitin. Label each peak with its charge state. What do you notice about the spacing of peaks along the x-axis. c)The figure shows an experimentally obtained electrospray mass spectrum for ubiquitin. Compare this spectrum to the spectrum you predicted. Are there any differences? If so, what might cause these differences?
- The ΔG°′ value for glucose-1-phosphate is -20.9 kJ/mol. If glucose and phosphate are both at 4.8 mM, what is the equilibrium concentration of glucose-1-phosphate?Cellular pH is slightly alkaline (pH 7.4); Explain why a seemingly slight decrease in pH to 6.8 can have very serious consequences for the body, becoming fatal?The-carotene molecule has λmax 450 nm and ɛ = 15.000 m2 / mol. Calculate the expected absorbance value for a solution in which 0.1 mg is dissolved in 10 mL of water. ( β-carotene, C40H56, 536 g/mol path length 1 cm)
