Assertion: calcium carbonate | /r/Desires | acid
Facets:
value: to dissociatethe calcium ca+2 cation
type: PURPOSE
Source sentences:
text: Calcium carbonate requires acid (H+ ions) to dissociate, and the H+ ions from the citric acid displace the calcium Ca+2 cation on the calcium carbonate (and the calcium then associates loosely with the citrate), which then releases carbonate as the fizzy (effervescent) CO2 (carbon dioxide).