Which statement correctly describes the effect of sodium bisulfate on pH in anesthetic solutions?

Which statement correctly describes the effect of sodium bisulfate on pH in anesthetic solutions?

• A. Lowers pH
• B. Raises pH
• C. No change
• D. Fluctuates

Answer: (A)

Sodium bisulfate lowers pH because it is an acidic salt that dissociates in water to give bisulfate ions, which release protons into the solution. When HSO4− donates a proton, hydronium ions (H3O+) form, increasing acidity and reducing the pH. In anesthetic solutions, especially those containing vasoconstrictors like epinephrine, keeping the solution acidic helps stabilize the epinephrine by slowing its oxidation, so formulators often add an acidifying agent such as sodium bisulfate to achieve a lower pH. So, the pH becomes more acidic when sodium bisulfate is present.

Sodium bisulfate lowers pH because it is an acidic salt that dissociates in water to give bisulfate ions, which release protons into the solution. When HSO4− donates a proton, hydronium ions (H3O+) form, increasing acidity and reducing the pH. In anesthetic solutions, especially those containing vasoconstrictors like epinephrine, keeping the solution acidic helps stabilize the epinephrine by slowing its oxidation, so formulators often add an acidifying agent such as sodium bisulfate to achieve a lower pH. So, the pH becomes more acidic when sodium bisulfate is present.