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Given the following cell notation for a voltaic cell Zn (s) Zn2+ (0.045 M) Cr3+ (0.800 M) Cr (s)
a) Write the balanced half-cell and overall equations. [3 Marks]
b) Calculate the standard cell potential, Eo cell. [2 Marks]
c) Determine the cell potential, Ecell. [3 Marks]
d) If the cell is allowed to operate spontaneously, will Ecell increase, decrease or remain constant with time? Explain. [2 Marks]
e) Determine the standard free-energy change (G) and free-energy change (G) of the cell. [4 Marks]
1. A 65 mL of 0.12 M NaF is reacted with 35 mL of 0.12 M Mg(NO3)2. The balanced equation of the reaction is shown below. NaF (aq) + Mg(NO3)2 (aq) → MgF2 (aq) + 2NaNO3 (aq)
a) Write the solubility product constant, Ksp expression for the solubility equilibrium of MgF2. [2 Marks]
b) Determine the molar solubility of MgF2 in the solution. (Ksp for MgF2 = 5.2 x 10-11 ) [8 Marks] c) Calculate the concentration of Mg2+ , F - , NO3 - and Na+ in the final solution. [4 Marks]
Interpret 2K(s)+2H2O(l)→2KOH(aq)+H2(g) quantitatively.
Calculate the mass of potassium needed to release 50 cm3 of hydrogen gas at room conditions. [Relative atomic mass : K = 39, 1 mol of gas occupies 24 dm3 at room conditions]
if 0.615 g of magnesium hydroxide reacts with 0.810 g sulfuric acid, what is the mass of the magnesium sulfate produced ?
Sulfuryl chloride is an inorganic compound with the formula SO2Cl2. It is a colourless liquid with a pungent odour. A quantity of 5.75 g of SO2Cl2 was placed in a 3.00 L flask. At 375 °C, there is 0.035 mole of Cl2 present. SO2Cl2(g) SO2(g) + Cl2(g) .calculate kc and kp
Sulfuryl chloride is an inorganic compound with the formula SO2Cl2. It is a colourless liquid with a pungent odour. A quantity of 5.75 g of SO2Cl2 was placed in a 3.00 L flask. At 375 °C, there is 0.035 mole of Cl2 present. SO2Cl2(g) SO2(g) + Cl2(g) .calculate kc and kp
What is the equilibrium constant for a reaction that has a value of Go = -41.8 kJ at 100oC?
What is the equilibrium constant for a reaction that has a value of Go = -41.8 kJ at 100oC?
A common reference electrode consists of a silver wire coated with AgCl(s) and immersed in 1 M KCl (pictured in Question 7).
AgCl (s) + e- → Ag(s) + Cl- (1 M) E° = 0.2223 V
What is Ecell when this electrode is a cathode in combination with a standard zinc electrode as an anode?
