Buffer capacity is a measure of a buffer solution's resistance to changes in pH as strong acid or base is added. Suppose that you have 165 mL of a buffer that is 0.300 M in both hydrofluoric acid (HF) and its conjugate base (F−) . Calculate the maximum volume of 0.470 M HCl that can be added to the buffer before its buffering capacity is lost.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

if you mean hydrogen and oxygen then water is the product

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