Anhydrous Calcium Hydrogen Phosphate (CaHPO₄) is a white or off-white powder that is almost insoluble in water or ethanol, but freely soluble in dilute hydrochloric acid or dilute nitric acid. It is used as a pharmaceutical excipient, diluent, and adsorbent.Key Specifications: Assay 98.0%–103.0%, chlorides ≤0.05%, sulfates ≤0.2%, lead salts ≤0.0005%, iron salts ≤0.04%, arsenic salts ≤0.0002%, carbonates (no turbidity with hydrochloric acid), insoluble in hydrochloric acid (residue ≤5 mg from 5.0 g sample), loss on ignition 6.6%–8.5% (at 800°C to constant weight), barium salts (no turbidity wit...