10. Four students are asked to describe a nebula and a star. Their responses are shown in the table below. Which student described these two celestial bodies correctly? Student 3 ⊝ Student 1 ⊝ Student 2 ⊝ Student 4

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

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