(a)
Interpretation:
Metal or metals in the product should be determined.
Concept introduction:
Reduction potential is the tendency of a chemical species to be reduced in a
(b)
Interpretation:
Probable reaction that occurs should be determined.
Concept introduction:
When two metals in contact, one with the highest reduction potential gets reduced while one with the lower reduction potential gets oxidized.
(c)
Interpretation:
The function of NaHCO3 should be determined.
Concept introduction:
pH is related to the concentration of protons or hydroxyl ions in a solution. Therefore, we can manipulate a driving force of a reaction which involves protons or hydroxyls, by changing the pH of the reaction mixture.
(d)
Interpretation:
How valid the two claims given in the advertisement about the product should be determined.
Concept introduction:
The overall reaction for tarnish removal process by Al is,
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GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
- How is the pH scale defined? What range of pH values corresponds to acidic solutions? What range corresponds to basic solutions? Why is pH = 7.00 considered neutral? When the pH of a solution changes by one unit, by what factor does the hydrogen ion concentration change in the solution? How is pOH defined? How arc pH and pOH for a given solution related? Explain.arrow_forwardAn aqueous solution of an unknown salt of vanadium is electrolyzed by a current of 2.50 amps for 1.90 hours. The electroplating is carried out with an efficiency of 95.0%, resulting in a deposit of 2.850 g of vanadium. a How many faradays are required to deposit the vanadium? b What is the charge on the vanadium ions (based on your calculations)?arrow_forwardWhat is the cell potential (Ecell) of a spontaneous cell that is run at 25C and contains [Cr3+] = 0.10 M and [Ag+] = 1.0 104 M?arrow_forward
- Calculate K at 25°C for each of the reactions referred to in Question 31.arrow_forwardCalculate G and K at 25C for the reactions in Exercises 38 and 42.arrow_forwardWhat characterizes an electrolytic cell? What is an ampere? When the current applied to an electrolytic cell is multiplied by the time in seconds, what quantity is determined? How is this quantity converted to moles of electrons required? How are moles of electrons required converted to moles of metal plated out? What does plating mean? How do you predict the cathode and the anode half-reactions in an electrolytic cell? Why is the electrolysis of molten salts much easier to predict in terms of what occurs at the anode and cathode than the electrolysis of aqueous dissolved salts? What is overvoltage?arrow_forward
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