What is the approximate ph at the equivalence point of a weak acid-strong base titration if 25 ml of aqueous hydrofluoric acid requires 30. 00 ml of 0. 400 m naoh? ka = 6. 76 × 10-4 for hf.

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

What is the mass of phosphorous in a 51-kg person