Which is true about the dissolving process in water?
a. polar solutes do not dissolve easily in water.
b. water molecules are attracted by solute ions at the surface of the solute.
c. water molecules move throughout the solute.
d. solute molecules pull water molecules away from the surface.

B. Water molecules are attracted by solute ions at the surface of the solute.

Explanation:

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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