In which of the following situations would mass be conserved? A. An uncovered pot of water is brought to a boil. B. An open container of baking soda has vinegar added to it. C. A log burns in an outdoor fire pit. D. A wax candle burns while in a sealed jar.

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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