Chemistry Practice Problems pH and pOH Practice Problems Solution: Calculate [OH-] for each of the following solution...

Solution: Calculate [OH-] for each of the following solutions, and indicate whether the solution is acidic, basic, or neutral. A solution in which [H+] is 1000 times greater than [OH-]. Express your answer using two significant figures.[OH-] = _____ M

Problem

Calculate [OH-] for each of the following solutions, and indicate whether the solution is acidic, basic, or neutral. 

A solution in which [H+] is 1000 times greater than [OH-]. Express your answer using two significant figures.

[OH-] = _____ M

Solution

We’re being asked to determine the OH- concentration if [H3O+] is 1000 times greater than [OH]


Recall: Kw = 1.0 × 10–14 at 25.0 ˚C.

Kw is the auto-ionization product of water. For the following reaction:


2 H2O(l) H3O+(aq) + OH(aq)


the auto-ionization product constant is given by:



Note that each concentration is raised by the stoichiometric coefficient:[H3O+] and [OH] are raised to 1.


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