lab number 3

Synthesis

The process of combining components to create a new compound.

Coordination Compound

A complex compound formed from a central metal atom bonded to surrounding molecules or ions.

Empirical Formula

The simplest whole-number ratio of elements in a compound.

Nickel(II) Ion (Ni²⁺)

A metallic ion of nickel with a +2 charge.

Mass Percent

The mass of a particular component divided by the total mass of the compound, multiplied by 100.

Ammonia (NH₃)

A colorless gas with a characteristic pungent smell; a compound used in the synthesis of coordination compounds.

Titration

A laboratory method used to determine the concentration of a solution by reacting it with a standard solution.

Spectrophotometry

An analytical method used to measure the concentration of light-absorbing species in a solution.

Back Titration

A method of titration where the excess titrant is determined instead of the amount reacted.

Hydrochloric Acid (HCl)

A strong acid used in titration to analyze ammonia content in nickel coordination compounds.

Bromcresol Green

A pH indicator that changes color at certain pH levels, useful in titrations.

Molar Absorptivity

A measure of how well a chemical species absorbs light at a given wavelength.

Beer's Law

A relationship that relates absorbance to concentration of an absorbing species.

Equilibrium Constant

A numerical value that describes the ratio of concentrations of products to reactants at equilibrium.

Percent Yield

The ratio of actual yield to theoretical yield, expressed as a percentage.

NiCl₂ • 6H₂O

Nickel(II) chloride hexahydrate; a used reactant in the synthesis of nickel coordination compounds.

Ni(OH)₂

Nickel(II) hydroxide, a possible by-product formed during synthesis.

Nickel Sulfate Hexahydrate (NiSO₄ • 6H₂O)

A compound used to prepare standard solutions of Nickel(II) for spectrophotometric analysis.

Acetone

An organic solvent that is flammable and used in the laboratory for washing purposes.

Solubility

The ability of a substance to dissolve in a solvent; important in synthesis procedures.

Indicator Color Change

A method used in titrations to visually determine the endpoint of the reaction.