Answer:
There are regions with tropical climate that have large temperature variations between summer and winter and these variations could be as high as 25-30 degree Celsius. Polar climate zone is characterized by extremely low temperatures throughout the year.
Reaction of galvanic cell
<h3>Further explanation</h3>
Given
Redox reaction between Zn and Mg
Required
Half reaction
Potential of the cell
Solution
Zn²⁺ + 2e -> Zn E ° = -0.76 V
Mg²⁺ + 2e -> Mg E ° = - 2.37 V
The higher E ° of the cell will act as the positive pole/cathode
Electrode Zn as a cathode (reduction) and Mg as an anode (oxidation) (E ° of Zn cells is greater than Mg)
Half reaction
Cathode: Zn²⁺ + 2e ⇒ Zn E ° = -0.76 V
Anode: Mg ⇒ Mg²⁺ + 2e E ° = +2.37 V
------------------------------------------------- ----------- +
Cell reaction: Zn²⁺ + Mg ---> Zn + Mg²⁺ E ° cell = +1.61 V
The reaction occurs spontaneously in the absence of an electric current, thus including galvanic cells/voltaic cells
Answer:
4.0406
Explanation:
Given that:
Concentration = 0.286 M
Consider the ICE take for the dissociation of acetic acid as:
HClO ⇄ H⁺ + ClO⁻
At t=0 0.286 - -
At t =equilibrium (0.286-x) x x
The expression for dissociation constant of acetic acid is:
x is very small, so (0.286 - x) ≅ 0.286
Solving for x, we get:
x = 9.1071×10⁻⁵ M
pH = -log[H⁺] = -log(9.1071×10⁻⁵) = 4.0406
I think the answer is Option A