An aqueous solution of calcium hydroxide is electrolysed using carbon electrodes.
2 answers:
Answer:
1) Oxygen will be liberated at anode
2) White precipitate is due to the formation of calcium carbonate CaCO3
Explanation:
1) The reactions at the anode and cathode involving the electrolysis of Ca(OH)2 are:
Cathode (reduction):
Anode (oxidation):
Thus oxygen gas will be liberated at anode
2) At the anode the O₂ gas reacts with the carbon (C) electrode to form CO₂ which then reacts with Ca(OH)₂ to form a white precipitate of CaCO₃.
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Answer:
Therefore the concentration of the reactant after 4.00 minutes will be 0.686M.
Explanation:
The unit of k is s⁻¹.
The order of the reaction = first order.
First order reaction: A first order reaction is a reaction in which the rate of reaction depends only the value of the concentration of the reactant.
[A] = the concentration of the reactant at time t
k= rate constant
t= time
Here k= 4.70×10⁻³ s⁻¹
t= 4.00
[A₀] = initial concentration of reactant = 0.700 M
Integrating both sides
⇒ -ln[A] = kt +c
When t=0 , [A] =[A₀]
-ln[A₀] = k.0 + c
⇒c= -ln[A₀]
Therefore
-ln[A] = kt - ln[A₀]
Putting the value of k, [A₀] and t
- ln[A] =4.70×10⁻³×4 -ln (0.70)
⇒-ln[A]= 0.375
⇒[A] = 0.686
Therefore the concentration of the reactant after 4.00 minutes will be 0.686M.