Which of these properties of an iron nail is a physical property? A. does not burn when a flame is applied
B. reacts with hydrochloric acid to release hydrogen gas
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C. composed of only one piece instead of fragments
D. rusts

what are the two models

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