chem. stuff+5

9. The reaction 2 H2O(l)>>>O2(g) + 2 H2(g) requires 2.06 V, but the reaction
2 H2O(l) + 2 Cl –(aq)>>> H2(g) + 2 OH –(aq) + Cl2(g) requires 2.19 V. If a 1.0 mol/L solution of aqueous NaCl is electrolyzed, what voltage should be applied to get O2(g), but not Cl2(g)?

How would I do this?

10. The electrolysis of aqueous NaCl produces the reaction that follows.

2 H2O(l) + 2 Cl –(aq)>>> H2(g) + 2 OH –(aq) + Cl2(g)

Which other aqueous solution could be electrolyzed to produce the same reaction?

How would I do this?

12. A student wanted to produce lithium using the reaction 2 Li +(l) + 2 Cl –(l)>>> 2 Li(l) + Cl2(g) at 650°C. Give three reasons why the voltages in the reduction half-reaction table in your data booklet would not help him estimate the required voltage.
My answer:
1. It does not contain Li liquid
2. Neither does it contain Cl liquid
3. The Voltages of the equations we do have do not add up to give enough power to produce lithium.

Can u check it please?

13. Why is it sometimes possible for a weaker oxidizing agent or a weaker reducing agent to be involved in an electrolytic reaction rather than the strongest agents?

How is this possible?

20. A pot is to be electroplated with 48.6 g of nickel from a Ni(NO3)2(aq) solution. The cathode compartment of an electrolytic cell can hold 2.50 L of solution. What concentration of Ni(NO3)2(aq) solution is necessary to supply the necessary nickel?

Can u help on these questions...they r the only ones I don't get...Thanks in advance!


9. The reaction 2 H2O(l)>>>O2(g) + 2 H2(g) requires 2.06 V, but the reaction
2 H2O(l) + 2 Cl –(aq)>>> H2(g) + 2 OH –(aq) + Cl2(g) requires 2.19 V. If a 1.0 mol/L solution of aqueous NaCl is electrolyzed, what voltage should be applied to get O2(g), but not Cl2(g)?

How would I do this?
Shouldn't it be above 2.06 but below 2.19?

10. The electrolysis of aqueous NaCl produces the reaction that follows.

2 H2O(l) + 2 Cl –(aq)>>> H2(g) + 2 OH –(aq) + Cl2(g)

Which other aqueous solution could be electrolyzed to produce the same reaction? What about KCl or LiCl or any chloride whose metal salt (Na, K, Li, etc) is above hydrogen in the activity series?

How would I do this?

12. A student wanted to produce lithium using the reaction 2 Li +(l) + 2 Cl –(l)>>> 2 Li(l) + Cl2(g) at 650°C. Give three reasons why the voltages in the reduction half-reaction table in your data booklet would not help him estimate the required voltage.
My answer:
1. It does not contain Li liquid
2. Neither does it contain Cl liquid
3. The Voltages of the equations we do have do not add up to give enough power to produce lithium.
I think both 1 and 2 of your answers are another way of saying that the voltages found in your booklet are those of a 1 M solution of the ion and the solid metal (in the case of Li) or gas at 1 atm pressure vs 1 M Cl^-(in the case of Cl). In molten LiCl this isn't so. Actually this is anactivity of 1 as opposed to a concentration of 1 M. I don't understand your #3 answer.
Can u check it please?

13. Why is it sometimes possible for a weaker oxidizing agent or a weaker reducing agent to be involved in an electrolytic reaction rather than the strongest agents?
Check out how the voltage changes with concentratin; i.e., the Nernst equation.
How is this possible?

20. A pot is to be electroplated with 48.6 g of nickel from a Ni(NO3)2(aq) solution. The cathode compartment of an electrolytic cell can hold 2.50 L of solution. What concentration of Ni(NO3)2(aq) solution is necessary to supply the necessary nickel?

Can't you determine how much Ni(NO3)2 must be in 2.5 L to have a minimum of 48.6 g Ni? Actually, you would need more Ni than this.
48.6 g Ni x (1 mol Ni(NO3)2/1 mol Ni) I hope this helps.

  1. 👍 0
  2. 👎 0
  3. 👁 126
asked by hey u!!

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Question 9 Unsaved What is the rate law for the following reaction, if the order of the reaction is m, an unknown? H2O2(aq) → H2O(l) + ½O2(g) a. k [H2O2]m b.k [H2O]m [O2]1/2 c.k [H2O] m /[H2O][O2 d.k[H2O] m [O2]m Thanks in

    asked by Ramon on March 23, 2018

  2. Enthalpy Change Calculations

    Find the heat of reaction (ΔH) for each of the following chemical reactions and note whether each reaction is exothermic or endothermic. 1. H2O(l) -> H2O(g) This is what I have so far: H2(g) + ½ O2(g) -> H2O(l) ΔH = -286.0

    asked by Emily on August 5, 2015

  3. Chemistry

    Predict the product(s) for the following reaction: H2SO4(aq) + KOH(aq) --> Choose one answer. a. K(s) + H2(g) + SO3(g) b. K2SO4(aq) + H2O(l) c. No reaction occurs d. K2S(aq) + H2O(l) e. KSO4(aq) + H2O(l) I keep getting: K2SO4(aq)

    asked by Toby on July 24, 2011

  4. Chemistry

    When given a chemical reaction, how would I know whether a reaction is endo or exothermic and whether work is done on the system or by the system. Without using any calculations. So I have a couple reactions which I have to use

    asked by Raj on November 20, 2007

  5. Chemistry

    A 0.879 g sample of a CaCl2 ∙ 2 H2O / K2C2O4 ∙ H2O solid salt mixture is dissolved in 150 mL of deionized water. A precipitate forms which is then filtered and dried. The mass of this precipitate is 0.284 g. The limiting

    asked by Destiny on March 7, 2019

  6. Chem

    I was given a problem that my book did not explain how to do, so I attempted to figure it out myself. Let me know if my conclusion is fallacious. Given the reactions H2O(g) + CO(g) H2(g) + CO2(g), K= 1.6 FeO(s) + CO(g) Fe(s) +

    asked by Chris on April 9, 2007

  7. chemistry

    25. Which of the two reactions, A or B is a neutralization reaction? Explain why. A. HBr + H2O = Br- = H3O+ B. HClO + NaOH = NaClO + H2O 26. A. Look at the reaction again. when this reaction is reversed. Br- + H3O+ = HBr = H2O

    asked by Sierra on September 16, 2014

  8. Chemistry

    Consider the reaction between 56.0 mL of liquid ethanol (C2H5OH; density = 0.789 g/mL) and 26.0 L of O2 at 27.0°C and a pressure of 1.95 atm. The products of the reaction are CO2(g) and H2O(g). Calculate the number of moles of

    asked by Anonymous on November 1, 2016

  9. chemistry

    Consider the reaction between 52.0 mL of liquid ethanol (C2H5OH; density = 0.789 g/mL) and 25.4 L of O2 at 27.0°C and a pressure of 1.65 atm. The products of the reaction are CO2(g) and H2O(g). Calculate the number of moles of

    asked by Tasha on November 9, 2014

  10. Chemistry Pretest

    Consider the following balanced equation. 2 H2 + O2 ---> 2 H2O Which of the following statements is false? a) One molecule of O2 will react with 2 molecules of H2 b) One mole of O2 will react with 2 moles of H2 c) The complete

    asked by Sarah on September 28, 2012

  11. chemistry

    The following reaction was carried out in a 2.00 reaction vessel at 1100 : C+H2O -> C)+H2 If during the course of the reaction, the vessel is found to contain 7.00mol of C, 13.3mol of H2o, 3.80mol of CO, and 7.20mol of H2, what is

    asked by JAclyn clark on April 28, 2013

More Similar Questions