In part II, you add sodium acetate to the solution of acetate. Why must you add sodium acetate to the solution? Because you need sodium as a counterion to iron. To neutralize any excess acid, which may prevent formation of the ferroin complex. Sodium acetate forms the ferroin complex. Sodium acetate allows you to dilute your solution of iron so you can analyze it.
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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