Is instant coffee compound solution or heterogeneous mixture?

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

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