Glutamine (HQ) is a diprotic amino acid with Kal = 6.5 x 10-3 and K2 = 1.00 x 10–9. Determine the pH of each of the solutions. A 0.199 M glutamine hydrochloride (H,Q*CI¯) solution. pH = 1.44 Incorrect A 0.199 M glutamine (HQ) solution. pH = 4.85 Incorrect A 0.199 M sodium glutaminate (Na*Q¯) solution. PH-
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- What is the actual chemical component for an anthocyanin (assume a cyanidin structure), and a carotenoid (assume a lutein structure), and indicate what is the common feature of these indicators that could act as an acid or base. (While the structures are complicated molecules, compare with acetic acid, CH3COOH, a weak acid).A protein has minimum solubility dissolved in a solution of 2.0 mL of water, 7.0 mL of 0.2 M sodium acetate and 1.0 mL of 0.5 M acetic acid. Estimate the pI of the protein.Calculate the pH of a .5M solution of the amino acid, aspargine, that was prepared from the form of asparganine that has a net -1 charge. Ka(-COOH) = 6.92x10^-3 and Ka(-NH3+)=1.86x10^-9 A. 4.52 B. 1.23 C. 5.45 D. 11.22 E. 7.93 F. 10.42
- The grid has six lettered boxes, each of which contains an item that may be used to answer the questions that follow. Items may be used more than once and there may be more than one correct item in response to a question. Place the letter(s) of the correct selection(s) on the appropriate line. Could dissolve Zn(OH)2 _____________ Could be used to prepare a buffer from __________ Halfway to the equivalence point in the titration of a weak, monoprotic acid with strong base ________ SO2-related atmospheric phenomenon __________ Species formed by a Lewis acid-base reaction ________ General condition required for precipitation to occur ________ [conj. base] = [conj. acid] in a buffer ___________Consider an aqueous solution containing H+, OH−, Ca2+, “H2CO3” [actually mostly CO2(aq)], HCO3−, CO32−, Ca(HCO3)+, Ca(OH)+, K+, and ClO4−. a)Write the charge balance equation for this solution. b)Which species comes from acid hydrolysis of Ca2+? Write the balanced acid hydrolysis reaction (with physical states) for Ca2+ and calculate Ka c) Which species must be an ion pair? Write the balanced ion pairing reaction, including physical states. Does ion-pair formation increase or decrease the ionic strength? By how much would μ change if 0.0010 M of this ion pair forms?Calculate the pH of a 2.5 M KOH solution at 25 ⁰C. 0.398 -0.398 4.0 x 10⁻¹⁵ 14.4
- For the amino acid alanine, the major species in solution at pH 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a p?a of 3 The amino group of alanine has a p?a of 8 Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7. __?__x10^?From the reaction CaCO3+CO2+H2O= Ca2+ + 2HCO3- A.) Show how it affects the chemistry of water, alkalinity and hardness of water B.) Its relationship to microbial degradation of organic matterplease explain the process and answer Mouthwash acts to clean and disinfect mouths. Two important considerations when designing a mouthwash solution are the pH, which should ideally not be too acidic (where saliva has a normal pH range of 6.2–7.6 and below pH 5.5 erosion may occur), and the resistance of the solution to changes in pH. One example of a buffering system used in mouthwash is based on the compound H3PO4 which has PKa values of 2.1, 7.2 and 12.3. i. Hand-draw the structure of the main phosphorus species at pH 7.0, as well as a balanced equilibrium equation showing the structures of the two main phosphoric acid species at pH 7.0.
- The Concentration of Mg2+ ions in seawater is 5.37 x 10-2 M. Calculate the pH at which Mg2+ is decreased to 1.0 x 10-5 M. Ksp of Mg(OH) is 8.9 x 10-12(In great detail) Valine (HV) is a diprotic amino acid with ?a1=5.18×10−3 and ?a2=1.91×10−10. Determine the pH of each of the solutions. A 0.303 M valine hydrochloride (H2V+Cl−) solution ph = ? A 0.303 M valine (HV) solution. ph = ? A 0.303 M sodium valinate (Na+V−) solution. ph = ?Consider the following data that was collected for a protein that contain 0.76 % tryptophan amino acids by weight (Molecular weight of tryptophan amino acids is 204 g/mol). Absorbance Concentration (mg/L) 0.0250 0.100 0.150 0.226 0.259 0.400 0.600 0.964 1.14 1.78 1.45 2.35 1.78 2.87 How many mg of the protein present in 1.00 L solution that shows an absorbance of 1.20?