Sources of error in colorimetry?

If i add water to oil what will happen

Asuspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. if one wishes to follow this process by monitoring the release of 14co2, at which positions in the glucose molecule would the 14c label need to be incorporated?

What is produced from neutralization of an acid and a base? a. hydronium ions b. citric acid c. salt and water