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3 years ago

Write an equation including the pKa value that describes the reaction of acetic acid with aqueous NaOH.

Chemistry

1 answer:

Snezhnost [94]3 years ago

8 0

Answer:

CH₃COOH + NaOH → NaCH₃COO + H₂O

CH₃COO⁻ + H₂O ⇄ CH₃COOH + OH⁻ pKa = 4.75

Explanation:

Acetic acid and NaOH make a neutralization reaction, where a salt and water are formed.

CH₃COOH + NaOH → NaCH₃COO + H₂O

Acetic acid gives protons to medium

CH₃COOH → CH₃COO⁻ + H⁺

NaOH gives hydroxides to medium

NaOH → Na⁺ + OH⁻

When we have protons and hydroxides, we can produce water. That's why it is a neutralization reaction.

The acid is weak, so the formed CH₃COO⁻ becomes in the conjugate strong base. This anion can make hydrolysis to water.

CH₃COO⁻ + H₂O ⇄ CH₃COOH + OH⁻ pKa = 4.75

The NaOH is a strong base, so the Na⁺, as the conjugate weak acid, can't make hydrolysis.

We can't make this equilibrium.

Na⁺ + H₂O ⇄ NaOH + H⁺ IMPOSSIBLE

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4 years ago

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Answer:

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3 years ago

A d1 octahedral complex is found to absorb visible light, with the absorption maximum occurring at 503 nm. calculate the crystal

Nina [5.8K]

237.9 KJ/mol⁻¹ crystal-field splitting energy is found to absorb visible light.

<h3>What is crystal-field splitting energy?</h3>

The energy of the electron configuration in the ligand field less the energy of the electronic configuration in the isotropic field is known as the crystal field energy.

The core metal ion's d orbitals split into two groups with various energies in an octahedral complex. The energy of the electron transition, which is related to the wavelength of the emitted light, is equal to the energy of the crystal-field splitting.

Δ = E = ℎ c / λ

Where,

where ℎ is the Planck constant, 6.62*10⁻³⁴m²kg s⁻¹, and c is the speed of light, 3 x 10⁸m s⁻¹.

Δ = 6.62*10⁻³⁴m²kg s⁻¹ / 503 x 10⁻⁹

= 3.95 x 10⁻¹⁹

= 3.95 x 10⁻¹⁹

This value is the splitting energy per ion.

To convert it to J/mol, we should multiply it by Avogadro number, 6.022 x 10²³mol⁻¹

= 3.95 x 10⁻¹⁹ x 6.022 x 10²³mol⁻¹

= 237.9 KJ/mol⁻¹

Therefore, the crystal-field splitting energy i<u>s 237.9 KJ/mol⁻¹ .</u>

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3 years ago

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