The hydroxide ion concentration is what is used to measure the POH of a substance (basicity) thus with more hydroxide that hydrogen ions, the solution is Basic.
Answer:
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Explanation:
There will be a transfer of thermal energy (heat) from the hot metal plate to the surrounding air. This transfer of energy equates to a transfer of kinetic energy in the molecules. As the plate loses heat, the molecules in the plate will lose kinetic energy and slow down. As the surrounding air gains heat, the molecules will gain kinetic energy and speed up.
For this problem, we use the Hess' Law.
ΔHrxn = ∑(ν*Hf of products) - ∑(ν*Hf of reactants)
The ν represents the corresponding stoichiometric coefficients of the substances, while Hf is the heat of formation. For pure elements, Hf = 0.
Hf of Al₂O₃ = <span>−1676.4 kJ/mol
</span>Hf of Fe₂O₃ = <span>-826.0 kJ/mol
Thus,
</span>ΔHrxn = 1*−1676.4 kJ/mol + 1*-826.0 kJ/mol
<em>ΔHrxn = -2502.4 kJ/mol</em>
Answer:
pH = 10
Explanation:
As the problem states, with strong bases<em> the hydroxide ion concentration [OH⁻] is equal to the concentration of the base</em>. That means that in this case:
With [OH⁻] we can <u>calculate the pOH of the solution</u>:
Then with the pOH, we <u>calculate the pH of the solution</u>: