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3 years ago

Write a balanced chemical equation for the standard formation reaction of solid calcium hydroxide .

1 answer:

3 0

Calcium Hydroxide (Ca(OH)2) can actually be formed by the reaction of Calcium Oxide (CaO) with water (H2O). The complete balanced chemical reaction is:

<span>The subscript 2 in (OH) means that there are 2 O and 2 H on the product side. Hence, the equation is balanced already.</span>

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A voltaic cell utilizes the following reaction: 4Fe2+(aq)+O2(g)+4H+(aq)â†’4Fe3+(aq)+2H2O(l).

kari74 [83]

Answer:

The Emf of the given cell at [Fe2+] = 2.0 M and [Fe3+] = 1.9 M is 0.48 V

Explanation:

The half cell reaction can be written as :

Anode-Half (oxidation) :

$Fe^{2+}\rightarrow Fe^{3+} + 1e^{-}$ ......E = 0.77 V

(multiply this equation by 4 to balance the electrons)

Cathode-half (reduction)

$4H^{+} +O_{2} + 4e^{-} \rightarrow 2H_{2}O$ ....E= 1.23 V

$E^{0}_{cell} = E_{cathode} - E_{anode}$

$E^{0}_{cell} = 1.23 - 0.77$

$E^{0}_{cell} = 0.46 V$

According to Nernst Equation

$E_{cell} = E^{0} - \frac{RT}{nF}lnQ$

$E_{cell} = E^{0} - \frac{0.059}{n}logQ$

n = number of electron transferred in the cell reaction = 4

The balanced equation is :

$4Fe^{2+} + 4H^{+} +O_{2} \rightarrow 4Fe^{3+} + 2H_{2}O$

$E_{cell} = 0.46 - \frac{0.059}{4}logQ$

$log Q = \frac{[Fe^{3+}]^{4}}{[Fe^{2+}]^{4}}$

$log Q = \left ( \frac{[Fe^{3+}]}{[Fe^{2+}]} \right )^{4}$

$log Q = \left ( \frac{1.9}{2.0} \right )^{4}$

Insert the value of log Q in Nernst Equation:

$E_{cell} = 0.46 - \frac{0.059}{4} log\left ( \frac{1.9}{2.0} \right )^{4}$

(using : $log^{a}b = a\log b$

)

$E_{cell} = 0.46 - log\frac{1.9}{2.0}$

$E_{cell} = 0.46 - log(0.95)$

$E_{cell} = 0.46 -(-0.0227)$

$E_{cell} = 0.482 V$

8 0

3 years ago

Please help me...thank you so much..

Bezzdna [24]

Answer:

you do it

Explanation:

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3 years ago

What problems might happen if an unnecessary hurricane warning was issues

deff fn [24]

People would rush to the store to buy supplies and there might not be enough for the "last minute noticed" people

4 0

3 years ago

GUYS I REALLY NEED THIS ASAP!!!!!

Nastasia [14]

Answer:

I don't think so

Explanation:

The equation doesn't look balanced

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3 years ago

Ethanol can react with hydrochloric acid to form chloroethane and water. When sulfuric acid is added, the

kaheart [24]

Answer: 1.Sulfuric acid is a catalyst

2. Vanadium(v) oxide is a catalyst

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2 years ago