Typically, when a buffer is made in the laboratory, the solutions of the weak acid and the salt of the conjugate base are mixed and adjusted to the correct pH using a strong acid or a strong base. Using each of HCl and NaOH as examples, respectively, explain how the strong acid or strong base react in solution (what ions are created) and how they react with the buffer components to change the pH. Use the following as your representative buffer: \ce{H2PO4- (aq) <--> H (aq) HPO4^2-}

19. at high pressures, how does the volume of a real gas compare with the volume of an ideal gas under the same conditions, and why? eman- it is much less because real gas partides are not moving. there is no difference because the gas laws are always obeyed. it is much less because at high pressures the temperature drops. it is much greater because real gas partides take up space.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Consider the story you just read. all but one of the choices below indicate that something is living.