For each of the following sets of blood values, name the acid-base imbalance (acidosis or alkalosis), determine its cause (metabolic or respiratory), decide whether the condition is being compensated, and cite at least one possible cause of the imbalance.

Problem 1: pH 7.63; PCO2 19 mm Hg; HCO3− 19.5 mEq/L

Problem 2: pH 7.22; PCO2 30 mm Hg; HCO3− 12.0 mEq/L