For ten points, name this class of compound, the most common example of which is sodium hydroxide.
Sodium fluoride acts as one of these when dissolved in bromine trifluoride, because it increases the concentration of the characteristic anion. They are often but not always strong nucleophiles. Usanovich defined them in the most general way possible as electron donors. Other definitions state that they donate an electron pair, or that they accept a hydrogen ion. For ten points, name this class of compound, the most common example of which is sodium hydroxide.
Sodium fluoride acts as one of these when dissolved in bromine trifluoride, because it increases the concentration of the characteristic anion.
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