3. The following analyses were performed for a water sample at 25 C pH [Ca Total alkalinity Total dissolved solids 6.2 150 ppm as CaCO, 300 ppm as CaCO, 200 ppm Calcutate the Langelier Saturation Index for this water. State whether this water has the tendency to form or dissolve scale. Show all work (
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- Calculate the mean ionic molality for 0.25m LaCls. [Ans. 1.1914 m] 570 nsmer For aqueous HCl solutions, it can be determined: Y- =0.72515 + 0.029188m + 0.055959m Determine the molality at which auCi= 1. (Note: This is the molality for the standard state of HCL in Water; pHCI) [Ans. 1.1914 m] %3DGravimetric assay of sulfuric acid involves step of precipitation by: BaCl2 Са(ОН) AGNO; FeCl3The solubility of CaCO3 is pH dependent. (a) Calculate themolar solubility of CaCO3 (Ksp = 4.5 x 10-9) neglectingthe acid–base character of the carbonate ion. (b) Use the Kbexpression for the CO32 - ion to determine the equilibriumconstant for the reactionCaCO3(s) + H2O(l) ⇌ Ca2 + (aq) + HCO3-1 (aq) + OH-1 (a q)(c) If we assume that the only sources of Ca2 + , HCO3-,and OH- ions are from the dissolution of CaCO3, what is the molar solubility of CaCO3 using the equilibrium expressionfrom part (b)? (d) What is the molar solubility ofCaCO3 at the pH of the ocean (8.3)? (e) If the pH is bufferedat 7.5, what is the molar solubility of CaCO3?
- Calculate the values for log Kow and the saturated aqueous solubility (Cw$sat) for bisphenol A. The value for log Kow is 3.62 ; enter your answer as X.XX The value for Cwsat is ; report your answer in units of moles/liter and enter it as X.XX×10(-X). Bisphenol A is closest to "phthalates" H3C CH3 HO HO,3.2. You are studying the hydration of compound X, which is represented by the reaction X + H2O =X – H2O. For this reaction AG = –28.23 kJ/mol. (a) Using a spectroscopic technique, you establish that a solution contains 3 x 10-3 M of X and 3.7 x 10-4 M of X – H20 at 25°C. What is AGf for the reaction under these conditions? In which direction is the reaction proceeding? (b) What is the final, equilibrium composition of the solution?A chemist received different mixtures for analysis with the statement that they contained NaOH, NaHCO3, Na2CO3, or compatible mixtures of these substances, together with inert material. From the data given, identify the respective materials, and calculate the percentage of each component. 1.000g samples and 0.2500N HCl were used in all cases. (A) For Sample W: With PP, 24.32ml was used. A duplicate sample required 48.64ml with MO. (B). For Sample X: The addition of PP caused no color change. With MO, 38.47ml of the acid was required. (C). For Sample Y: To cause a color change in the cold with PP, 15.29ml of the acid was necessary, and an additional 33.19ml was required for complete neutralization. (D) For Sample Z: The sample was titrated with acid until the pink of PP disappeared; this process required 39.96ml. On adding an excess of the acid, boiling, and titrating back with alkali, it was found that the alkali was exactly equivalent to the excess acid added.
- Using activities, calculate the molar solubility of Mg(OH)2 (Ksp= 7.1E-12) in a sol'n that is 0.0333M of Na2SO4Calculate the molar solubility of tin(II) hydroxide (Ksp = 5.45x10-27). Give your answer to three sig. figs. and in exponential form (e. g. 1.23E-2).The equilibrium constant of the reaction N2 (g) + 3H2(g) --> 2 NH3 (g) at 39 oC is Keq = 593,266. (b) What is the standard reaction Gibbs energy of this reaction? 3 sig. fig. Answer in exp. format, e.g. 5.14E3, -4.32E-4, ...
- A reaction mixture (mixture 1) at 298 K has a N2O4(g) partial pressure of 0.1 bar anda NO2(g) partial pressure of 0.05 bar. Calculate the reaction Gibbs energy (∆??) formixture 1 at 298 K. A second reaction mixture (mixture 2) is prepared at 298 K with a N2O4(g) partialpressure of 0.05 bar and a NO2(g) partial pressure of 0.10 bar. (i) Calculate the reaction Gibbs energy (∆??) for mixture 2 at 298 K. (ii) Comment on the spontaneity of the forward reaction for mixture 1 and mixture 2.Support your answer with the values of ∆?? calculated for the two mixtures. please give solution and answerAt a certain temperature, the solubility of zinc(I) chromate is (7.6x10^-5) M. What is the Ksp? Report your answer to 2 sig figs. Note: Your answer is assumed to be reduced to the highest power possibleAnalysis of dissolved sulfate concentration is based on the precipitation reaction of barium sulfate, creating Baso4 5) (named barite) and its settling. The following water quality is given: TDS = 650 mg/I, (SO) = 40 mg/l as S. Solubility constant of BaSO:: Kip (Baso.) = 1.1 1010 Determine how many mg of BaCl, should be added to 200 ml of a solution at the given quality for completely precipitating the sulfate. That is, calculate the dose required for 99.9% removal, while assuming saturation with respect to barite is immediately reached.