Why is HCl used in sahlis method to determin hb count?
We add Hydrochloric acid (hcl) to convert hemoglobin to acid hematin which is a brownish red color, which we compare with the color of the glass of the Sahli apparatus (Hemoglobinometer). The meniscus (Glass containing the solution) should have marks thatmeasureboth the hemoglobin amount and percentage in the blood.