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slavikrds [6]
2 years ago
6

Consider the following reaction at 298K.

Chemistry
1 answer:
lakkis [162]2 years ago
8 0

The true statements are;

  • K < 0
  • Eocel  < 0

<h3>What is a redox reaction?</h3>

We define a redox reaction as one in which a specie is oxidized and another is reduced.

Now;

Eo cell = cell potential = -0.13 V - (+0.34 V) = -0.47 V

n =number of moles of electrons = 2 mole of electrons

K = equilibrium constant

ΔG = change in free energy

Eo cell = 0.0592/n log K

-0.47 =  0.0592/2 log K

log K =  -0.47  * 2/0.0592

K = 1.3 * 10^-16

ΔG = -nFEo cell

ΔG = -(2 * 96500 * -0.47)

ΔG = 90.7kJ

Learn more about Ecell:brainly.com/question/10203847

#SPJ1

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A sample of 0.2140 g of an unkown substance monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.950 M NaOH. Th
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Solution :

The equation is :

$HA (aq) + NaOH(aq) \rightleftharpoons NaA(aq) + H_2O(l)$

The number of the moles of HA os 0.00285, and the volume is 25 mL.

15 mL of the 0.0950 M NaOH is added.

The total volume of a solution is V = 25 mL + 15  mL = 40 mL

The pH of the solution is 6.50

Calculating the K_a of HA

$HA(aq) \rightleftharpoons A^-(aq)+H^+$

K_a=\frac{[A^-].[H^+]}{[HA]}

Let s calculate the concentration of HA and NaOH

$[HA] = \frac{^nH_A}{V}$

        $=\frac{0.00285 \ mol}{0.04 \ L}$

       = 0.07125 M

$[NaOH]= \frac{0.015L \times 0.0950 M}{V}$

            $=\frac{0.001425 mol}{0.04L}$

           = 0.0356 M

                                      $HA(aq) \ \ + \ \ NaOH(aq) \ \  \rightleftharpoons NaA(aq) \\ + \ \  H_2O(aq)$

Initial conc. (M)            0.07125 M       0.0356 M            0 M

Change in conc. (M)   -0.0356 M       -0.0356 M        + 0.0356 M

Equilibrium conc. (M)   0.03565 M        0 M                0.0356 M

Therefore, the concentration of HA and the NaA at the equilibrium are [HA] = 0.03565 M and [NaA]= 0.0356 M

0.0356 M of NaA dissociates completely into 0.0356 M Na^+ and 0.0356 M A^-

Now for [H^+]

$[H^+] = 10^{-pH}$

       $=10^{-6.5}$

       $=3.16 \times 10^{-7}$

Calculating the value of K_a,

K_a=\frac{[A^-].[H^+]}{[HA]}

     $=\frac{0.0356 \times 3.16 \times 10^{-7}}{0.03565}$

     $=3.16\times 10^{-7}$

Therefore the the value of K_a for the unknown acid is $3.16\times 10^{-7}$.

     

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How does changing the concentration change the ph of a solution
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Answer:

There is a direct relationship between pH and concentration. I.e

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Explanation:

As the concentration of a solution changes, the H+ concentration changes hence from the relationship pH= -log[H+] the pH also changes

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