What variable did the researchers intentionally vary in the experiment, and what are the units for this variable? what variable did the researchers intentionally vary in the experiment, and what are the units for this variable? inorganic phosphate (inorganic phosphate) concentration, in micromoles per milliliter of sampled buffer glucose 6-phosphate concentration, in micromoles per milliliter of sampled buffer ph, in ph units time of reaction, in minutes?