A liquidated damages clause sets an amount in a contract in the event of a breach. A liquidated damages clause isn't a penalty, though it may sound like one. A penalty is usually disproportionate to the actual harm, and is meant to punish or deter breaching a contract.
Acidic stools can be caused from absorption problems from the diet and foods you eat. Some people have acidic stools as a result of a lactose intolerance.
When there is increased level of acid that is necessary to digest protein, it can damage the stomach lining leading to bleeding and ulcer. The digested blood causes the stool to appear tarry and black. The damage of stomach lining could make the stool to appear sticky.