Consider the following chemical equation: NaOH (aq) + HCl (aq) ® NaCl (s) + H2O (l), the reactant NaOH?

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In the chemical equation given, NaOH is listed as one of the reactants. NaOH stands for sodium hydroxide, which is commonly known as caustic soda or lye.

To determine the reactant NaOH, we can look at the left side of the equation before the arrow. In this case, NaOH is on the left side, indicating that it is one of the starting materials or reactants.

NaOH is an aqueous solution, denoted by "(aq)", which means it is dissolved in water. Aqueous solutions imply that the compound is in a liquid state and is mixed with water.

Therefore, in the given chemical equation, NaOH is one of the reactants.