Chemistry Practice Problems Strong Acid-Base Calculations Practice Problems Solution: Calculate the [H3O+] of each aqueous solution with...

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Solution: Calculate the [H3O+] of each aqueous solution with the following [OH-].Part A         NaOH, 1.0 x 10 -2 M         Express your answer using two significant figures.Part B          milk of magnesia, 1.2 x 10 -5 M           Express your answer using two significant figures.

Problem

Calculate the [H3O+] of each aqueous solution with the following [OH-].

Part A

         NaOH, 1.0 x 10 -2 M

         Express your answer using two significant figures.


Part B

          milk of magnesia, 1.2 x 10 -5

          Express your answer using two significant figures.



Solution

A) Since NaOH is a strong base, it will dissociate completely in the solution. This means that the concentration of hydroxide ions after dissociation will be the same as the initial concentration of NaOH. [H3O+] can be calculated using the ion-product constant of water (kw) and [OH-

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