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3 years ago

A concept map for four types of intermolecular forces and a certain type of bond is shown.

Chemistry

1 answer:

vladimir2022 [97]3 years ago

7 0

Answer:

c. D represents ion-dipole forces, which are stronger than the force represented by C.

Explanation:

From the map:

D represents ion-dipole forces.

C represents H-bonding forces.

Ion dipole forces are the forces between a charged ion and polar molecule and it is electrostatic in nature.

Hydrogen bonding is a special case of dipole-dipole forces and it is present when there is a H=atom bonded to an electronegative atom such as: N, O, and F.

Ion dipole forces is stronger than that of H-bonding.

so, the right choice is:

c. D represents ion-dipole forces, which are stronger than the force represented by C.

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A buffer solution contains 0.496 M hydrocyanic acid and 0.399 M sodium cyanide . If 0.0461 moles of sodium hydroxide are added t

pochemuha

Answer : The pH of the solution is, 9.63

Explanation : Given,

The dissociation constant for HCN = $pK_a=9.31$

First we have to calculate the moles of HCN and NaCN.

$\text{Moles of HCN}=\text{Concentration of HCN}\times \text{Volume of solution}=0.496M\times 0.225L=0.1116mole$

and,

$\text{Moles of NaCN}=\text{Concentration of NaCN}\times \text{Volume of solution}=0.399M\times 0.225L=0.08978mole$

The balanced chemical reaction is:

$HCN+NaOH\rightarrow NaCN+H_2O$

Initial moles 0.1116 0.0461 0.08978

At eqm. (0.1116-0.0461) 0 (0.08978+0.0461)

0.0655 0.1359

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=9.31+\log (\frac{0.1359}{0.0655})$

$pH=9.63$

Therefore, the pH of the solution is, 9.63

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3 years ago

How can naphthalene be separated from a mixture of kbr and sand?

Dmitriy789 [7]

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And in this way, nephthalene be separated from the mixture of KBR and sand.

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