15. The arrow hits the same spot in the center of the target every time. This is . a. precise c. accurate
b. both precise and accurate d. neither precise nor accurate
16. The measurement 7000.0 Km has significant figures.
a. 1 c. 5
b. 4 d. 2

yes they ca   is ur ansswerrr

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