.Heat of Neutralization.
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- 2. Calculate the heat of solution per mole (kJ/mol) of the sample.Consider a HCI solution with a pH of 4.70. a) Calculate the concentration of HCl. b) Identify the two underlying assumptions in part a). c) The original solution is diluted by 1,000 fold. Calculate the pH of the resulting solution. Make sure to indicate if the forementioned assumptions are still valid.2. 500 ml of a 0.1 M sodium phosphate buffer with pKa = 7.21, is diluted %3D a) How would you dilute this buffer 100 times to make a final volume of 50 ml? Show the ratios to be added together. b) Calculate the pH of the buffer when it is diluted with dH20 c) Calculate the pH of the buffer when it is diluted with 0.3 M KCI %3D 3. What is the normality of a 5 M phosphoric acid (SG = 1.88 g/cm³; 85% solution has a Mr of 98 g/mole
- Complete the table below. Assume that the only reaction is dissolution. Ignore the effects of acid/base hydrolysis. Show complete solutions. Show both the rounded and non-rounded answers. For the rounded answer, express in exactly 5 significant figures. Salt Ksp Common ion [cation] [anion] AgX 2.24 х 103 М х 5.27 х 109м Hg2X2 1.33 x 102 M Hg2* 1.65 x 107 MDetermine the weight/volume of the chemicals needed to prepare the following solutions: a) 100 ml of 0.9% (w/v) saline (NaCl) b) 30 ml of 50% glycerol (v/v) c) Electrophoresis requires TAE, which is a specific mixture of Tris base, acetic acid, and EDTA. TAE is normally made as a 50X concentrated stock. Provide a recipe to make 40 ml of 50X TAE. The recipe for one liter of 50X TAE is as follows: 242g Tris base, 57.1 ml glacial acetic acid, 100 ml 0.5 M EDTAWhat is the purpose of: A. The concentrated salt solution? B. adding isopropyl alcohol to the solution? Why does it need to be in low temperature?
- Scott test is one of the methods used for screening for Cocaine in Forensic Chemistry. The multi step method consists of a) reacting the sample drug with cobaltous thiocyanate (Co(SCN)2) b) dissolving of the formed precipitate by adding HCl and c) extraction of coordination compound with Chloroform d) measurement of absorbance of extracted coordination compound at 627 nm What is the type of chemical equilibria involved in first step of the method? a.Solubility Product equilibria b.Bronsted Lowry acid – Bronsted Lowry base equilibria c.Complex ion formation d.Coordination compound formationBalance the Alka-Seltzer tablet chemical equation and Identify the acid and base in the reaction.1) Calculate the required gram of Tris-Hcl to prepare 1M, 100 ml Tris-HCl (Tris Stock) with mol and Molarity formula. 2)Calculate the required gram of EDTA to prepare O.5M, 100 ml EDTA (EDTA stock) mol and Molarity formula. 3.) Calculate the required volume of Tris Stock to prepare buffer A which contains 25 mM Tris-Hcl with final volume is 100 ml by using M1V1 =M2V2 formula 4) Calculate the required volume of EDTA stock to prepare buffer A which contains 10 mM EDTA with final volume is 100 ml by using M1V1 =M2V2 formula 5)Do the same for Buffer B calculations
- NEORAL oral solution contains 100 mg/mL of cyclosporine. If a pharmacist prepares 30 mL of an oral solution containing 10% w/v cyclosporine, how many milliliters of diluent should be used?Benzalkonium chloride 17% w/v . . . . . qs Water qs . . . . . . . . . . . . . . . . . . . . . . 120 mL M. ft . solution such that 2 tbsp added to a pint of water will yield a 1:750 solution. How many milliliters of the 17% w/v stock solution will be needed to prepare the 120 mL? a 2.68 mL b 7.90 mL c 15.80 mL d 20.40 mL e 6.28 mLA 1.000-g sample containing bromide was dissolved in sufficient water to give 100.0 mL. A 50.00 mL aliquot was measured and after acidification, silver nitrate was introduced to precipitate AgBr, which was filtered, washed, and then dissolved in an ammoniacal solution of potassium tetracyanonickelate(II): Ni(CN)42- + 2AgBr(s) → 2Ag(CN)2- + Ni2+ + 2Br- The liberated nickel ion required 11.70 mL of 0.002146 M EDTA. The other 50.00 mL remaining solution was also analyzed for its Br- content by potentiometry using a metallic electrode of the second kind. e) Write the cell notation of the potentiometric set-up with SCE as the reference electrode. f) Write the Nernst equation that describes the indicator electrode set-up.