Which of the following are properties of ionic compounds?

Which of these is the correct equation for the dissociation of water? H2O + H2O+<==> H2O + OH– H2O + H2O <==> H3O+ +

Irina-Kira [14]

Answer:

Option b = H2O + H2O <==> H3O+ + OH–

Explanation:

Dissociation of water:

The water molecule dissociate into the hydroxyl ion and hydrogen ion. The hydrogen ion immediately protonate the other water molecule and form the hydronium ion.

Chemical equation:

H2O + H2O <==> H3O+ + OH–

The equilibrium constant of self ionization of water is given below:

Kw= [H3O+][OH-]

[H3O+] is the concentration of hydronium ion while [OH-] is the concentration of hydroxyl ion.

Kw is called ionic product of water. The value of Kw is 1.0 × 10∧-14 at 25 °C.

The pure water consist of equal concentration of hydroxyl and hydrogen ions. In order to determine the molarity of both ions square root of ionic product (Kw) is taken.

[OH-]=[H+]= 1.0 × 10∧-7 M

In case of acidic solution concentration f hydrogen ions are greater than hydroxide ions. For example,

HCl when dissociate into water gives H+ and Cl-. The H+ ions increases in solution. The equilibrium is this given by water.

H2O ⇆ H+ + OH-

Reaction is forced to wards left. As a result concentration of hydroxide ions decreases.

In case of base solution like KOH when dissociate it gives K+ and OH -. The concentration of hydroxyl ions increases in this case and concentration of H+ is decreases and ionic product remain constant.

6 0

4 years ago

What is Earth science?

kifflom [539]

Answer:Earth science or geoscience includes all fields of natural science related to planet Earth. This is a branch of science dealing with the physical and chemical constitution of Earth and its atmosphere. Earth science can be considered to be a branch of planetary science, but with a much older history.

Explanation: hope it helps

4 0

3 years ago

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A chemist has two solutions of H2SO4. One has a 40% concentration and the other has a 25% concentration.

vodomira [7]

Answer:

16 liters of the solution with 40% concentration must be mixed with 62 liters of the solution with 25% concentration in order to obtain 78 liters, 25% concentration solution.

Explanation:

Let the required volume of solution 1 be represented by x.

The required volume of solution 2 would then be 78-x.

The number of moles of solution 1 that would be required = 0.4x

The number of moles of solution 2 that would be required = 0.25(78-x)

The number of moles of the final mixture = 78 x 0.28 = 21.84

moles of solution 1 + moles of solution 2 = moles of final mixture

0.4x + 0.25(78 - x) = 21.84

0.4x + 19.5 - 0.25x = 21.84

0.4x - 0.25x = 21.84 - 19.5

0.15x = 2.34

x = 15.6 liters

To the nearest tenth = 16 liters

Liters of 40% solution needed = 16 liters

Liters of 25% solution needed = 78 - 16 = 62 liters.

Hence, 16 liters of the solution with 40% concentration must be mixed with 62 liters of the solution with 25% concentration in order to obtain 78 liters, 25% concentration solution.

7 0

3 years ago

4 grams of carbon react with an unlimited amount of H2O. The reaction is: C + H2O → CO + H2is the equation balanced?

shepuryov [24]

C + H2O → CO + H2 - this reaction is balanced,
1 mol C 1 mol C
2 mol H 2 mol H
1 mol O 1 mol O

4 0

4 years ago

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Which of these statements best explains the identity of reaction A

mezya [45]

Answer:

It is a chemical reaction because total mass remain unchanged.

Explanation:

A chemical reaction is represented by a chemical equation which show the reactant and products. Reactants are written on left side of arrow while products are written on right side. The number of atoms are remain same however arrangement of atoms is different on both side.

For example:

6H₂O + 6CO₂ + energy → C₆H₁₂O₆ + 6O₂

it is known from balanced chemical equation that 6 moles of carbon dioxide react with the six moles of water and created one mole of glucose and six mole of oxygen. The number of atoms are same on both side however arrangement of atoms is different.

While in case of nuclear reaction small change in mass take place.

8 0

3 years ago