CHEM 1B De Anza College Molar Volume of Hydrogen Gas Final Lab Report

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Science

Chem 1B

De Anza College

CHEM

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Please answer all problems in detailed, clear process. I want it to be written instead of typed as well

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Chem 1B Lab Final March 18th, 2020 Name: 1. For the reaction: Mg (s) + 2HCl (aq) → MgCl​2​ (aq) + H​2​ (g) Patm = P​H​2​ + P ​H2​​ O a) Calculate the molar volume of hydrogen gas produced given the following data: mass of Mg (s) = 0.0334g volume of H​2​ (g) produced = 33.1 mL T = 19.7​O​C atmospheric pressure: 768 mm Hg b) Calculate % error. 2.​ What are some of the limitations to getting accurate results for calculation of the Enthalpy of Vaporization of Ethanol in the experimental set-up that was used for Experiment B2? Chem 1B Lab Final March 18th, 2020 Name: 3. a) List all the reactions taking place in the Iodine-Clock Reaction. b) What is the limiting reagent in this reaction. Explain the role of the “limiting reagent”. c) Explain how the data collected for the experiment, i.e time it takes for the dark blue/purple color is used in the calculation of the rate of the reaction. d) What was the effect of using a catalyst on the overall reaction rate and why? e) How is the activation energy calculated from the data collected? Chem 1B Lab Final March 18th, 2020 Name: 4. ​For the reaction Fe​+3​ (aq) + SCN​-​ (aq) ⇄ Fe(SCN)​+2 a) Generate the ICE Table b) Explain how spectrophotometry is used in calculating the Kc of the reaction. 5. ​Calculate the Ka of a weak monoprotic acid, if the pH of a 0.5M solution is 4.0 6. ​a) What is an indicator? Explain how an indicator works. Chem 1B Lab Final March 18th, 2020 Name: b) In Experiment B6, how did you determine the ​λ​max ​for the indicator Bromocresol Green. c) How would you figure out pK​In​ experimentally, from the Equation log ​(​A-A​H​ ​/​ A​L​-A​) = ​ -pH + pK​In ​Explain. Chem 1B Lab Final March 18th, 2020 Name: 7.​ In experiment B7, the Green Crystal, the percent oxalate is analyzed by the titration of the green crystal with permanganate. a) Write down the balanced equation. b) Figure out the oxidation states of Manganese and Carbon. c) If the molarity of a standardized KMnO​4​ is 0.04M, and the initial and final burette readings from the titration are 4.8 mL and 10.8 mL, calculate the mass % oxalate in 0.1043 g of the green crystal. Chem 1B Lab Final March 18th, 2020 Name: 8. For the reaction Ca(OH)​2​ (s) ⇄ Ca​+2​ (aq) + 2OH​-​ ​(aq) lnK = ​-ΔH​O​ (​ 1 ​) + ​ΔS​O R T R a) How are ΔH​O ​and ΔS​O​ calculated from the above equation? Summarize the experiment and the subsequent data analysis. b) How is the Equilibrium Constant (Kc) determined experimentally? Show your work and the corresponding ICE table.
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