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3 years ago

A solution has a pH of 4.20. Using the relationship between pH and pOH, what is the concentration of OH−?

Chemistry

2 answers:

PilotLPTM [1.2K]3 years ago

5 0

Answer: The concentration of $OH^-$ is $1.58\times 10^{-10}$

Explanation:- pH or pOH is the measure of acidity or alkalinity.

pH is defined as negative logarithm of hydrogen ion concentration. pOH is defined as the negative logarithm of hydroxide ion concentration.

The relation between pH and pOH is given as:

$pH+pOH=14$

Given : pH = 4.20

$pOH=14-4.20=9.8$

$pOH=-log[OH^-]$

$9.8=-log[OH^-]$

$[OH^-]=antilog(-9.8)$

$[OH^-]=1.58\times 10^{-10}M$

frez [133]3 years ago

4 0

Answer : The concentration of $OH^-$ ion is, $1.58\times 10^{-10}M$

Solution : Given,

pH = 4.20

First we have to calculate the pOH.

As we know that,

$pH+pOH=14$

$pOH=14-pH$

$pOH=14-4.20$

$pOH=9.8$

Now we have to calculate the concentration of $OH^-$ ion.

$pOH=-\log [OH^-]$

$9.8=-\log [OH^-]$

$[OH^-]=1.58\times 10^{-10}M$

Therefore, the concentration of $OH^-$ ion is, $1.58\times 10^{-10}M$

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4 years ago

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Neko [114]

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What are London dispersion forces?

A sort of force that interacts between atoms and molecules that is often electrically symmetric is referred to as a London dispersion force.
When viewed from the nucleus, their electron distribution is frequently symmetrical. This dispersion force, which is also known as a transient attractive force, is frequently observed when the locations of the electrons in two nearby atoms cause the atoms to temporarily form dipoles.
The bond is polar when there are significant variations between the elements' electronegativities; it is nonpolar when there are similarities. When the molecule's dipole moment is equal to O, it is nonpolar; when it differs from O, it is polar.
The force at these molecules is known as the London dispersion force. In nonpolar molecules, the forces are weak, and partial charges must be induced so that they can bond. In polar molecules, partial charges caused by polarity result in a stronger link known as a dipole-dipole. The dipole-dipole is significantly stronger and known as a hydrogen bond if it is connected to a large electronegative atom (F, O, or N). Ionic force is the name for the attraction force at ionic substances.
The intermolecular force in the letter an is the London dispersion force because the compound is nonpolar;

<u>Reason for incorrect options:</u>

b: the compound is ionic because Na is a metal and the other part is covalent,

c: two compounds are possible: one is nonpolar and exhibits London dispersion force; the other is polar and exhibits dipole-dipole force; and

d: both compounds exhibit hydrogen bonds (H bonded to O, and H bonded to F).

NOTE: Your question is incomplete, but most probably your full question was, which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind? Which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind?

A. $C_{4}H_{10}$

B. $NaC_{2}H_{3}O_{2}$

C. $CH_{2}C_{12}$

D. $C_{2}H_{5}OH HF$

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2 years ago

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egoroff_w [7]

Answer:
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Explanation:
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Increase in concentration of reactants will increase the number of reactants per unit volume. Therefore, the probability of collisions will increase hence, it will result in the increase in yield.

Temperature:
Increase in temperature increases the kinetic energy of reactants. Therefore, the increase in velocity of reactants results in the collisions with high energy. It makes it feasible for reactants to attain the optimum energy (activation energy) to convert into products with good yield.

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6 0

3 years ago

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Bingel [31]

Answer:

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Conclusion: Acidic copper sulphate solution turns blue litmus to red

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8 0

3 years ago

Which of the following conditions will ensure that a chemical reaction will definitely proceed in the forward direction, toward

Grace [21]

Answer:

When ΔS > ΔH/ T, then the reaction will proceed forward

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The entity that determines the whether a reaction will occur on its own in the forward direction (Spontaneity or Feasibility) is Gibb's free energy.

Gibb's free energy is the energy available to do work. It is denoted as 'G'. It cannot be easily measured. The change (ΔG) can only be measured. ΔG = ΔH - TΔS

when ΔG is positive, The reaction is not spontaneous (reaction will not occur on its own)

When ΔG is negative, The reaction is spontaneous (reaction will occur on its own)

When ΔG is zero, the reaction is in equilibrium

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For reaction to be spontaneous, TΔS > ΔH

Therefore, ΔS > ΔH/T

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4 years ago