The most common approach to control paper acidity is to include calcium carbonat

Question

The most common approach to control paper acidity is to include calcium carbonate (chalk) in the paper mix. As the paper is produced, some of the calcium carbonate reacts with the acid released by the lignin. What is the conjugate acid of carbonate? The most common approach to control paper acidity is to include calcium carbonate (chalk) in the paper mix. As the paper is produced, some of the calcium carbonate reacts with the acid released by the lignin. Write the net ionic reaction for the reaction of carbonate with the acid released from lignin.

Explanation / Answer

1. The conjugate acid of carbonate is HCO3- (bicarbonate)

2. CO32- (aq) + H+ (aq) ------> HCO3- (aq)

HCO3- (aq)    + H+ (aq) --------->   H2CO3 -------> H2O (l) + CO2 (g)

hydrogen cabonate is unstable and decomposes to give carbondioxide and water.

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