Oceans - Acid-base equilibria and pH
9 important questions on Oceans - Acid-base equilibria and pH
What is the formula for Kw? What can this be simplified to?
Kw = [H+][OH-] / H2O
Kw = [H+][OH-]
What are always the units for Kw?
mol^2dm^-6
What is the pH of 0.1m sol of NaOH?
1 x 10^-14 = [H+][0.1]
(1 x 10^-14)/ 0.1 = [H+]
[H+] = 1 x 10^-13
pH = -log[1 x 10^-3]
pH = 13
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What equation would you use to find the pH for strong acids?
pH = -log[H+]
What assumptions do we use when it comes to weak acids? Explain what approximation is likely to lead to the greater inaccuracy. *always comes up in exams*
1. [H+] = [A-]
2. Due to small amounts of dissociation, [HA] eqm = [HA] intial
Number 2 is the greatest inaccuracy because some of the HA will react (especially if it is a strong acid which depends of the question being asked)
If the equilibrium lies to the right, what does this say about the acid?
It is a strong acid (the more the eqm lies to the right the stronger the acid)
Give the formula of the acid from which H2PO3- is derived.
H3PO3
Suggest why it is important that energy for a reaction comes from the sun rather than from burning fossil fuels?
Burning fossil fuels releases CO2 into the atmosphere.
Suggest an environmental impact of a reaction which produces carbon dioxide.
It contributes to global warming.
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