Acompound was found to be soluble in water. it was also found that addition of acid to an aqueous solution of this compound resulted in the formation of carbon dioxide. which one of the following cations would form a precipitate when added to an aqueous solution of this compound?

a. nh4
b. k
c. cr
d. rb
e. na

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

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

If a particle has z = 25 and 23 electrons, what is its charge?