Phosphoric acid (h3po4) has pka values of 2.14, 6.86 and 12.4. over what range of ph values would a solution containing both h2po4 - and hpo4 2- be an effective buffer?

Are hallucinogen a clinically useful drugs?

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

How does the viscosity of magma change as magma cools?