Which of the following species is a molecular element?1. neon 2. carbon dioxide3. chlorine 4. sodium 5. none of the above

the ph of a solution of HCl in water is found to be 2.50. what volume of water would you add to 1.00L of this solution to raise

morpeh [17]

Answer:

To raise the pH of the solution to 3.10 we have to add 2.34 L of water.

Explanation:

Given that the pH of the solution of HCl in water is 2.5. Here the solution’s pH is changing from 2.5 to 3.10 which means the acidic nature of the solution is decreasing here on dilution. $[H^+]$ ions contribute to a solution’s acidic nature and $[OH^-]$ contribute to a solution’s basic nature.

The equation connecting the concentration of $[H^+]$ and pH of a solution is pH= $-log[H^+]$

 $[H^+]= 10^(^-^p^H^)$ $[H^+]= 10^(^-^2^.^5^)=0.00316$ 

When the pH is $3.1 [H^+ ]= 10^(^-^3^.^1^)=0.000794$ 

On dilution the concentration of a solution decreases and volume increases.

 $M_1 V_1 = M_2 V_2$ 

 $0.00316 \times 1 = 0.000794 \times V_2$ 

 $V_2 = \frac{(0.00316 \times 1)}{0.000794} =3.24$ 

Volume of water to be added $=3.24-1$ 

 $=2.24L$ 

6 0

3 years ago

How is geothermal produced

soldier1979 [14.2K]

The steam rotates a turbine that activates a generator, which produces electricity. Many power plants still use fossil fuels to boil water for steam. Geothermal power plants, however, use steam produced from reservoirs of hot water found a couple of miles or more below the Earth's surface.

4 0

3 years ago

Read 2 more answers

Listed in the Item Bank are some important labels for sections of the image below. To find out more information about labels, so

daser333 [38]

Answer:

Explanation:

Electrons have negative charge and they orbit around the nucleus.

Protons have positive charge and are inside the nucleus

Neutrons have neutral charge they are also inside the nucleus

the nucleus is the middle of the atom

the electron cloud is a cloud which the electrons travel around

5 0

3 years ago

What is the significant number of valence electrons?

Kipish [7]

Answer:

valence electrons are necessary for an atom to reach a state of stability.

Explanation:

5 0

4 years ago

How many particles are in 1.40 x 10^7 mol of aluminum (Al)?

SpyIntel [72]

Answer:

<h3>Hlo there !! </h3>

One mole of any substance contains 6.022*1023 structural units (atoms, molecules, ions, etc.). This number is known as the Avogadro constant.

One mole of any substance contains 6.022*1023 structural units (atoms, molecules, ions, etc.). This number is known as the Avogadro constant.So 1.04*107 mol of Al contains 1.40*107 * 6.022*1023 = 8.43*1030 structural units (in case of Al – atoms).

<h3>8.43*1030 particles Al.</h3>

Explanation:

<h3>Hope this helps !!</h3>

5 0

2 years ago