Which of the four solutions is the best buffer against addition of acid or base?

a. na2hpo4

b. na2hpo4 + nah2po4

c. nah2po4

d. h2o submit for grading save and finish later?

What mass of calcium carbonate is produced when 250 mL of 6.0 M sodium carbonate is added to 750 mL of 1.0 M calcium fluoride

Which is the correct equilibrium constant expression for the following reaction? Fe2O3 (s) + 3H2 (g) - -> 2Fe (s) + 3H2O (g) Kc = [Fe2O3] [H2]3/[Fe]2[H2O] Kc = [Fe]2[H2O]3/[Fe2O3] [H2]3 Kc = [H2]/[H2O] Kc = [H2O]3/[H2]3 Kc = [Fe] [H2O]/[Fe2O3] [H2]

The reaction 4Fe + 3O2 >> 2Fe2O3 is an example of what?

What is 4 stages of pregnacy

A form of electricity which can attract things

What is the biggest difference between an exothermic and endothermic process? A. The direction of energy flow. B. The amount of energy transferred. C. The type of energy being transferred. D. The speed with which energy is transferred.

The mass of 1 mol of chromium (atomic mass 51.996 amu) is

Which of the following elements will tend to form a cation? A. Oxygen B. Nitrogen C. Sulfur D. Lead E. All of the Above

Is pure orange juice a solution or a suspension

If a catalyst is used in a reaction: a. the energy of activation increases. b. the reaction rate does not change. c. the reaction rate increases. d. the equilibrium shifts.