A patient presents with the following:    pH:  7.31   PCO2: …

A patient presents with the following:    pH:  7.31   PCO2:  25 mmHg   HCO3-:  16 mEq/L Identify whether:  Acidosis or alkalosis?  Respiratory or metabolic?  Compensated or uncompensated?   (Normal pH range: 7.35- 7.45; normal PCO2: 35-45mmHg; normal HCO3-: 22-26 mEq/L)