Final answer:
The molar concentration of sodium hydroxide (NaOH) will decrease when the solution is made more acidic, as the increased H+ ions react with OH- ions, resulting in a decrease in molarity.
Step-by-step explanation:
The reported molar concentration of sodium hydroxide (NaOH) will change depending on the nature of the solute and solvent interaction. When a solution becomes more acidic (i.e., when more H+ ions are present), the solubility of salts that are composed of the conjugate bases of weak acids will generally increase. As NaOH is a strong base, it fully dissociates in water to form Na+ and OH- ions. When the solution is made more acidic by adding an acid such as sulphuric acid, H2SO4, which dissociates into 2H+ and SO4^2- ions, the H+ ions will react with the OH- ions from the NaOH to form water. This reaction removes OH- ions from the solution and reduces the molarity of NaOH as the OH- ion is a part of the NaOH chemical formula.