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.
Ok what do u need help with
Answer:
they often use a radon detector to help forecast earthquakes
Answer: any non-living thing
Explanation: abiotic means non-living