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marta [7]
3 years ago
12

An aqueous solution at 25∘C has a hydronium ion concentration of 3.2×10−9 M. What is the hydroxide ion concentration of the solu

tion? Write your answer in scientific notation. Use the multiplication symbol rather than the letter x in your answer. Report your answer two significant figures.
Chemistry
1 answer:
Anika [276]3 years ago
4 0

Answer:

3.1 × 10⁻⁶ M

Explanation:

One water molecule can react as a base while other water molecule acts as an acid to form and hydronium ion and a hydroxide ion.

H₂O(l) + H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)

The equilibrium constant (Kw), known as the ionic product of water, has the following form:

Kw = [H₃O⁺] × [OH⁻]

The value of Kw at 25°C is 1.0 × 10⁻¹⁴.

An aqueous solution at 25°C has a hydronium ion concentration of 3.2 × 10⁻⁹ M. The hydroxide concentration is:

Kw = [H₃O⁺] × [OH⁻]

1.0 × 10⁻¹⁴ = 3.2 × 10⁻⁹ × [OH⁻]

[OH⁻] = 3.1 × 10⁻⁶ M

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A sample of helium gas has a pressure of 1.5 atm at 23 C. At what Celsius
Nina [5.8K]

Answer:

180.87 °C

Explanation:

Applying pressure law,

P/T = P'/T'..................... Equation 1

Where P = Initial pressure of helium gas, T = Initial Temperature of helium gas, P' = Final Pressure of helium gas, T' = Final Temperature of helium gas

Make T' the subject of equation 1

T' = P'T/P......................... Equation 2

From the question,

Given: P = 1.5 atm, P' = 2.3 atm, T = 23°C = (23+273)K = 296 K

Substitute these values into equation 2

T' = (2.3×296/1.5)

T' = 680.8/1.5

T' = 453.87 K

T' = 453.87-273

T' = 180.87°C

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3 years ago
Calculate the mass of O​ 2​(in g) that is needed to produce 0.75 mol MgO. Round your answer to 2 decimal places. show work
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3 years ago
In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions)
jeyben [28]

Answer:

Li2S> Na2S> K2S> CsS

Explanation:

The lattice energy of ionic species depends on the relative sizes of ions in the ionic compounds. As the size of ions increases, the lattice energy decreases and vice versa.

When the size of the anions are the same, the lattice energy now depends on the relative sizes of the cations. Therefore, since all the compounds are sulphides and the order of magnitude of ionic sizes is: Li^+ < Na^+ < K^+ < Cs^+.

Therefore, the order of decrease in lattice energy is; Li2S> Na2S> K2S> CsS

7 0
3 years ago
An atom has 81 electrons, 84 neutrons, and 82 protons. What element is this atom?
posledela

Answer:

Lead

Explanation:

The subatomic particles within an atom can be used to know the atom or element given.

Of particular interest is the number of protons within the atom.

The periodic table is based on the atomic number of atoms. This atomic number is the number of protons within an atomic space.

So; If we know the number of protons within an atom, we can know the element.

The number of protons given is 82, the element is  therefore lead.

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3 years ago
Which of the following will result in a chemical change?
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3 years ago
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