Lowering an object decreases its potential energy.
true
false

True

if your hold something high it has more potential energy so you can safely assume that if you do the opposite it would decrease

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l