Calculate Eo for Cr2+ +2e Cr from a) Cr* + 3e - Cr Eo = -0.76 V %3D b) Cr3* +e Cr2+ Eo = 0.63 V 1. %3D a. 0.44500 b. -0.69500 c. 0.82500 d. -1.45500 e. 0.06500
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- The E°cell = 0.135 V for the reaction %3D 312(s) + 5Cr20,2(aq) + 34H*(aq) → 6103 (aq) + 10Cr³+(aq) + 17H2O What is Ecell if [Cr2072] = 0.044 M, [H*] = 0.16 M, [IO3] = 0.00016 M, and [Cr3*] = 0.0041 M? Ecell = i VThe E°cell = 0.135 V for the reaction3I2(s) + 5Cr2O72-(aq) + 34H+(aq) → 6IO3-(aq) + 10Cr3+(aq) + 17H2OWhat is Ecell if [Cr2O72-] = 0.014 M, [H+] = 0.21 M, [IO3-] = 0.00018 M, and [Cr3+] = 0.0039 M?Ecell =Average Volume of NaOH used: 16.3mL +16.3ml + 16.1ml + 16.3mL +16.1mL V. average = 16.22mL NaOHag) Uncertainty on average volume: 0.05+0.05 +0.05 + 0.05 + 0.05 AUerage = 0.05mL Final answer: 16.22 + 0.05mL Molar Concentration of HClag: Reaction Equation HCl(aq) - NaOH aq) - NaCl aq) – H2O() OH sa = 16. 22ml x - 1000ml
- The Nernst-Planck equation (shown below) describes the motion of a charged chemical species in a fluid. dC; z,FC; dv J; = - D; dx RT dx' What are the units for the ion flux J, where: zis the valence state of the ion (unitless) C is the concentration (mol/m³) Fis the Faraday constant (Coulomb/mol) Ris the ideal gas constant (kg m²/(s² mol °K)) Tis the temperature (K) dCi/dx is the concentration gradient (mol/m*) dV/dx is the electric potential gradient (V/m) D; is the diffusion coefficient (m²/s) Note that Coulomb is a unit of charge and V is volts where 1 V= 1 Joule/Coulomb)- 144 / Natural Sciences / Chemistry And Polymer Science / Chemie zzes / Oplossingsewewig | Solubility Equilibria A solution contains 0.002 M Ag* and 1.6 x 105 M Zn2*, and the ions need to be separated. For this purpose co- is added to the solution so that both Ag,CO3 (Ksp = 8.1 x 10-12) and ZnCO3 (Ksp = 1.0 x 10-10) can precipitate from the solution. What will the concentration of co; be just before the first salt starts to precipitate. (Please give your answer with 2 significant figures.) Answer CheckWhich one of the following reactions will occur spontancously at standard-state conditions and 25"C? O 2AI3+ + 3Fe - 2Al + 3Fe2+ O Mg+ + Ca - Mg + Ca? O Ni?+ +2Fe?*(aq) Ni(s) + 2Fe"(aq) + Au + 3K Cu+ + H2 O Au + 3K*+ O Cu + 2H-
- Given the information below, the following statement is correct about the following reaction: 2Cr3+ + 7H2O + 3Br2 -> Cr2O72- + 14H+ + 6Br- Cr2O72- + 14H+ + 6e- ---> 2Cr3+ + 7H2O Ero= +1.33 V Br2 + 2e- ---> 2Br- Ero= +1.07 V Question 25 options: It will occur spontaneously because it has a positive cell potential of 2.40 V It will not occur spontaneously because it has a negative cell potential of -0.81 V It will occur spontaneously because it has a positive cell potential of 1.88 V It will occur spontaneously because it has a positive cell potential of 0.81 V It will not occur spontaneously because it has a negative cell potential of -0.26 VChlorinated solvents such as carbon tetrachloride (CCl4) can be degraded in a process called reductive dechlorination where Cl atoms are removed and replaced with H atoms. For example: CCl4 + H+ +2e¯ ⇒ CHCl3 + Cl- Eº-0.67 V In the process of in situ bioremediation an electron donor such as acetate (CH3COO-) is typically added and is oxidized to provide the electrons for the reduction of CCI4. In groundwater devoid of oxygen, nitrate typically serves as the electron acceptor. Answer the questions below using data from Appendix A and that provided above. i) Is it possible that CCl4 could serve as an electron acceptor for acetate? ii) Which electron acceptor, CCl4 or NO3, would be thermodynamically preferred? iii) What do the results in i and ii imply for remediation in an aquifer containing nitrate? (provide a qualitative answer)Consider the corrosion Of overall reacthon: copper 9 30 ouco) + 0.5 Ozcg) + 2H,0" caq)-> Cu? cas) +3 Ho OO) It the parhal pressure Of onygen is 0.88 bar thle concentration of' cu2+Cuq) is 6.lM.W what PH does the neachon loecome 8pontaniebus ? IS 0.88 bar,3 the
- The concentration of a NAOH solution is determined in a single experiment by titrating a weighed sample of pure, dried KHP (MW = 204.229) with the NaOH. The data are: Weight of KHP = (11.6723 ± 0.0001) - (10.8364 ± 0.0001) g = (32.68 ± 0.02) – (1.24 ± 0.02) mL %3D Volume NaOH Where the standard deviations are o, values. (a) What is the molarity of the NaOH? (b) Based on the propagation-of-error formula, what is the standard deviation of the molarity,on ?There is actually something im confused about, when you calculating V0 for S0=200uM --> V = 0.48*200/ 2.42 + 1 Why are you only using the S0 value=200uM one place in the equation and then using the S0 value from given data the second place in the equation? Shouldnt S0 be 200 uM both places in the equation?Ca(OH)2(aq) + 2HCl(aq) → CaCl2(8) + 2H2O(1) 2. Standar... 1req For the reaction 3. AS surrou... 1req 4. AG° = A... 1req 5. AG: Pre... 1req 6. AG: Enthal... M 7. AG fro... 1req 8. Calculat... 1req 9. Calculat... 1req Question Question Question 10. Calcul... 1req AH° 30.2 kJ and AS° = 206 J/K The equilibrium constant for this reaction at 280.0 K is Assume that AH° and As are independent of temperature. Submit Answer Retry Entire Group 3 more group attempts remaining