If you perform a 4-point 1:2 dilution of a 0.5M stock solution, what will be the final concentration? If you perform a 2-point 1:4 dilution of a 0.5M stock solution, what will be the final concentration?
If you perform a 2-point 1:16 dilution with a 1M stock solution, what will be the final concentration? What are the volumes of the stock and diluent used in each step if the final volume is 500mL?
Using the final solution from #3, if you perform a 4-point 1:4 dilution with a final volume of 100mL, what will be the final concentration?

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explanation:

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