Sodium Hydroxide ($NaOH$) 0.1 N in Methanol is a specialized volumetric solution used primarily for non-aqueous titrations. In this preparation, sodium hydroxide is dissolved in anhydrous methanol rather than water to achieve a concentration of 0.1 Normal (which, for NaOH, is equivalent to 0.1 Molar). Methanol (CH3OH) acts as the carrier. Because methanol is an alcohol, it allows for the titration of organic acids and compounds that are poorly soluble in water or would undergo unwanted side reactions (like hydrolysis) in an aqueous environment. This solution is highly sensitive to atmospheric carbon dioxide (CO2), which reacts to form sodium carbonate precipitates, and moisture, which can alter its “non-aqueous” properties.