The pH of the wetted straw reference sample was 7.8. Acid
treatment of the strawreduced the pH to 4.7. Thewetted straw
reference sample required 14.5 ml of titration solution, while
the acid pre-treated straw required 8.3 ml of titration solution.
The acid treatment was found to be effective in reducing the
pH and the buffering capacity of the straw specimens.