*Write the reversible reaction of two water molecules dissociating into the Hydr

Question

*Write the reversible reaction of two water molecules dissociating into the Hydronium ion(HiO) and the Hydroxide ion(OH).
*When pure water reaches a state of dynamic equilibrium, which molecule in the highest concentration? (H,o, Hyo or OH)
* What is the concentration ofeach ion in pure water?
*What happens when an acid water? *What happens when a base is added to pure water?
*Write the reversible reaction of sodium hydroxide dissociating into its ions.
* How does this dissociation allow sodium hydroxide to act as a base? *What does pH measure?

Explanation / Answer

1. H2O (l) + H2O (l) <:::::::::::::::::::::::> H3O+ (aq) + OH- (aq)

2. H2O Because from the mole ratio, there are two moles of H2O for every mole of H+ and H3O+.

3. 1.0 x 10-7M (each of the ions [OH- and H3O+] has this concentration).

4. An acid increases the concentration of protons H+ while a base increases the concentration of OH-.

5. NaOH (aq) <:::::::::::::::::::::::::> Na+ (aq) + OH- (aq)

6. The dissociation of NaOH increases the concentration of OH- ions, therefore it acts as a base.

7. pH measures the concentration of hydrogen ions in a solution. NB. Feel free to ask for clarifications especially regarding the dynamic equilibrium

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