1. The problem statement, all variables and given/known data Could you suggest an experiment to determine the efficiency of sodium hydrogensulphate(IV) as a wine preservative? 2. The attempt at a solution I just think that since wine contains ethanol, which would be oxidized in air to form ethanoic acid slowly, by comparing the pH value of the wine between a sample exposed to air and a control can the efficiency be determined. But how can I CALCULATE the efficiency? or are there other better and more convenient ways?