Chapter 19, Problem 118A

Interpretation Introduction

Interpretation: To check if the pH of the solution increases or decreases during the deacidification process.

Concept Introduction: The method of treating paper for the neutralizing acids within the paper is known as deacidification.

Answer to Problem 118A

The pH of the deacidification process is increased, and the solution will become more alkaline.

Explanation of Solution

The method of treating paper for the neutralizing acids within the paper is known as deacidification. They are either aqueous or non-aqueous solutions. Most deacidification processes are used to neutralize acidity it uses some earth-alkaline metals.

The first step in popular deacidification methods is to immerse the paper in a dilute solution of calcium hydroxide.

The chemical equation representing the deacidification step can be depicted as follows:

  $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}\left(s\right)+\text{Ca}\left({\text{HCO}}_{\text{3}}\right)\left(s\right)\to 2{\text{CaCO}}_{\text{3}}\downarrow +2{\text{H}}_{\text{2}}\text{O}\left(l\right)$

Calcium bicarbonate is treated with calcium hydroxide yields calcium carbonate and water. The precipitate calcium carbonate is formed.

Conclusion

Thus, the pH of the deacidification process is increased, and the solution will become more alkaline.