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4 years ago

What symbol is used to show the standard reduction potential of an oxidation reaction in a half-cell?

1 answer:

6 0

The reduction potential of an oxidation reaction in a half-cell is denoted by the symbol E°.
Reduction potential is the tendency of a given chemical species to become reduced, that is, gain electrons or undergo a decrease in oxidation number. The greater the reduction potential, the more likely that a species will be reduced.

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Which of the following is not a conjugate acid-base pair? A) NH4+/NH3 B) H30-OH OC) H2SO3/HSO3 D) C2H302-/HC2H302

raketka [301]

Answer : The option (d) is not a conjugate acid-base pair.

Explanation :

According to the Bronsted Lowry concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.

Or we can say that, conjugate acid is proton donor and conjugate base is proton acceptor.

(a) The equilibrium reaction will be,

$NH_4^++OH^-\rightleftharpoons NH_3+H_2O$

In this reaction, $NH_4^+/NH_3$ are act as a conjugate acid-base.

(b) The equilibrium reaction will be,

$H_3O^++OH^-\rightleftharpoons H_2O+H_2O$

In this reaction, $H_3O^+/OH^-$ are act as a conjugate acid-base.

(c) The equilibrium reaction will be,

$H_2SO_3+OH^-\rightleftharpoons HSO_3^-+H_2O$

In this reaction, $H_2SO_3/HSO_3^-$ are act as a conjugate acid-base.

(d) The equilibrium reaction will be,

$C_2H_3O_2^-+H_2O\rightleftharpoons HC_2H_3O_2+OH^-$

In this reaction, $C_2H_3O_2^-/HC_2H_3O_2$ are act as a conjugate base-acid.

Hence, from this we conclude that, the option (d) is not a conjugate acid-base pair but it is a act as conjugate base-acid.

6 0

3 years ago

One way to determine the pH of a solution is to measure the concentration of the acid and base forms of the indicator colorimetr

ki77a [65]

Answer:

pH = 4.26

Explanation:

Bromocresol green is a commonly used pH indicator. The concentration ratio of the acid form to base form explains its color, which reflects the pH of the medium.

C₂₁H₁₄Br₄O₅S + H₂O ⇄ C₂₁H₁₃Br₄O₅S⁻ + H₃O⁺

acid conjugate base

We can calculate the pH through Henderson-Hasselbalch's equation:

$pH=pKa+log(\frac{[base]}{[acid]} )=4.66+log(\frac{1}{2.49} )=4.26$

7 0

3 years ago

What is the enthalpy of reaction from the following energy diagram?

ozzi

A. -20kj

Explanation:

The reaction is exothermic

therefore enthalpy = 20 - 40 = -20

7 0

3 years ago

Read 2 more answers

Which state of matter is characterized by having an indefinite shape, but a definite volume?.

harkovskaia [24]

Answer:

A liquid

Explanation:

Liquids has an indefinite shape, which means it could change from one shape to another. For example, if you pour water into a rectangular fish tank. The shape of the liquid changes into a rectangle. Definite volume means its volume is consistent and that it is unchangeable. If you fill the rectangular fish tank with water, the volume of the water stays the same even though it changes shape.

Hope this helps.

7 0

3 years ago

What does a plant produce during photosynthesis? A. Oxygen and glucose B. Carbohydrates and carbon C. Carbon, oxygen, and hydrog

Nataliya [291]

Answer:

im pretty sure b

Explanation:

3 0

4 years ago