Which is more acidic, H3PO4 in water or H3PO4 in H2SO4, and why? Posted on April 19, 2017 by admin Which is more acidic, H3PO4 in water or H3PO4 in H2SO4, and why? Which is more acidic, H3PO4 in water or H3PO4 in H2SO4, and why?