The pH of acidic, basic, and neutral aqueous solutions of salts is shown with ammonium chloride, sodium acetate, and sodium chloride. Place beakers containing distilled water and universal indicator ...

An acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with their ...

It also revealed a way in which some compounds -- nucleic acids -- could replicate and keep life going. The base pairs within DNA, which actually transfer the genetic code, are made of simple ...