Would the concentration of hydroxide ion in a 0.30 m solution of potassium hydroxide (koh) be greater than, less than, or equal to 0.30 m?

Potassium hydroxide KOH is a strong base which can completely ionize to form potassium and hydroxide ions.

The equation representing ionization of KOH,

The mole ratio of hydroxide to KOH from the above equation is

The given concentration of KOH solution=0.30M

Calculating the concentration of hydroxide ions present in 0.30M KOH solution:

Therefore the concentration of hydroxide ion will be equal to 0.30 M in a 0.30 M KOH solution.

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the answer for sodium is 0.186

the answer for rubidium is 0.251