Ex 14. Will magnesium shavings dissolve if added to an aqueous solution of ferrous sulphate? Justify your answer! pºMg2+/Mg = -2,714 V; ºFe2+/Fe = -0,44 V a/ Yes, because Mg is a stronger oxidant than Fe b/ Yes, because Mg is a stronger reducer than Fe c/ No, because Mg is a weaker reducer than Fe d/ No, because Mg is a weaker oxidant than Fe
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- Which species from below is oxidized? Write the half reaction. Which species from below is reduced? Write the half reaction. 10 grams of Ag in 0.1M Cu(NO3)2 Ag (g) Cu (g) Ag+ Cu2+ Max. Temperature Color Observation 10 g 5.88641e-14 3.70529e-14 0.100000 25o C Blue 10 grams of Cu in 0.1M Cu(NO3)2 Cu (g) Cu2+ Max. Temperature Color Observation 10 g 0.100000 250 C Blue and orange at the bottom of flask 10 grams of Zn in 0.1M Cu(NO3)2 Zn (g) Cu (g) Zn2+ Cu2+ Max. Temperature Color Observation 9.67310 g 0.317730 g 0.100000 Around 0 Around 300 C White/ transparent 10 grams of Pb in 0.1M Cu(NO3)2 Pb (g) Cu (g) Pb2+ Cu2+ Max. Temperature Color Observation 8.96400 g 0.317729 g 0.0999996 3.92983e-7 About 270 C White/ transparent 10 grams of Mg in 0.1M Cu(NO3)2 Mg (g) Cu (g) Mg2+ Cu2+ Max. Temperature Color Observation 9.87850 g 0.317730 g 0.100000…Which is equivalent to 2,500 ppm Cu2+?Molecular Weight: Cu (63.55) a. 0.07868 N (in precipitation reaction) b. 0.07868 N (in redox into Cu+)15- Which is not an error associated with an incorrectly defined pH measurement? a) contact potential deviation- AgCl or Ag precipitates due to dilution of KCl or presence of reducing reagent b) alkaline fault - electrode responds to Na+ instead of H+ when [Na+] is low and [H+] is high c) acid error – the measured pH is higher than the actual pH because the glass is saturated with H+ and can no longer be protonated d) temperature – pH meter calibrated at different temperatures from the sample
- Maximise the uptime and include a qualitative analysis on energy storage systems; What are the risks for downtime of the separator? Can the emulsion formed lead to an early end of the separation process? What can you do to mitigate this? What can you say about energy storage systems such as batteries? Consider redox flow batteries as an alternative to Li ion battery technology.Ochem help with prelab The experiment is attached and involves the reduction of a nitro group to an amine The Chemicals are: 200 mg of m-nitroacetophenone 400 mg of granular tin 4 mL of 6M hydrochloric acid 30% sodium hydroxide Need help with the prelab which requires... A. Write the balanced equations for both half-reactions of the redox and then the overall balanced redox equation B. Determine the limiting reagent and the theoretical yield of amineWhich is not an error associated with an incorrectly defined pH measurement? A) contact potential deviation-AgCl or Ag precipitates due to dilution of KCl or presence of reducing reagentB) alkaline fault - electrode responds to Na+ instead of H+ when [Na+] is low and [H+] is highC) acid error – the measured pH is higher than the actual pH because the glass is saturated with H+ and can no longer be protonatedD) temperature – the pH meter is calibrated at different temperatures from the sample
- Based on Ksp you calculated in the previous question, which is 1.10 * 10*-2. what is delta G for the dissolution of lithium tetraborate at 25 celcius2) If 25g of NaCl is dissolved into a final volume of 500mL, what is the percent (w/v) concentration of NaCl in the solution? COMPUTE 3) How will you prepare 200mL of 0.3M NaCl prepared? COMPUTE and Include a short instruction in the preparation. 4) From a stock solution of 1M Tris solution, how will you prepare 400mL of 0.2M? COMPUTE and Do not forget to include a short instruction in the preparation. 5) How is 4mL of 50mM NaCl solution be prepared from a 2M NaCl stock? COMPUTE and Do not forget to include a short instruction in the preparation. 6) What is the molar concentration of a 10% NaCl solution? (At 25⁰C, the density of 10% NaCl is 1.09 g/ml ) COMPUTEOne method for determining whether an individual recently fired a gun is to look for traces of antimony in residue collected from the individual’s hands. Anodic stripping voltammetry at a mercury film electrode is ideally suited for this analysis. In a typical analysis a sample is collected from a suspect using a cotton-tipped swab wetted with 5% v/v HNO3. After returning to the lab, the swab is placed in a vial that contains 5.0 mL of 4 M HCl that is 0.02 M in hydrazine sulfate. After soaking the swab, a 4.0-mL portion of the solution is transferred to an electrochemical cell along with 100 μL of 0.01 M HgCl2. After depositing the thin film of mercury and the antimony, the stripping step gives a peak current of 0.38 μA. After adding a standard addition of 100 μL of 00×102 ppb Sb, the peak current increases to 1.14 μA. How many nanograms of Sb were collected from the suspect’s hand?