Water
hydrogen ions+hydroxide=water
which can be verified by dark reaction of photosynthesis
Answer:
Kinetic energy of electron = -E₂ = 3.4 ev
Kinetic energy of electron = -E₄ = 0.85 ev
Explanation:
In case of hydrogen atom energy associated with nth state is,
En = -13.6/n²
For n = 2
E₂ = -13.6 / 2²
E₂ = -13.6/4
E₂ = -3.4 ev
Kinetic energy of electron = -E₂ = 3.4 ev
For n = 4
E₄ = -13.6 / 4²
E₄ = -13.6/16
E₄ = -0.85 ev
Kinetic energy of electron = -E₄ = 0.85 ev
Answer:
pH = 12.5
Explanation:
The reaction that takes place is
- 2OH⁻(aq) + Pb⁺²(aq) → Pb(OH)₂(s)
The OH⁻ species come from the metal hydroxide of the solution, and Pb(OH)₂ is the precipitate.
Now we <u>convert 3.81 grams of Pb(OH)₂ into moles</u>, using its <em>molar mass</em>:
- 3.81 g ÷ 241.12 g/mol = 0.0158 mol Pb(OH)₂
Now we <u>convert 0.0158 Pb(OH)₂ moles into OH⁻ moles</u>, using the <em>stoichiometric coefficients of the reaction</em>:
- 0.0158 mol Pb(OH)₂ *
= 0.0316 mol OH⁻
With the given concentration (1 L), we <u>calculate [OH⁻]</u>:
- [OH⁻] = 0.0316 mol / 1 L = 0.0316 M
Then we <u>calculate the pOH</u> of the solution:
And finally we <u>calculate the pH</u>: