Which pair of substances would most likely result in the production of a solid when reacting with a base? litmus and phenolphthalein soluble metal salt and carbon dioxide acids and water hydrogen ions and soaps

Soluble metal salt and carbon dioxide

Both soluble metal salt and carbon dioxide may react with a base to form a solid or what we call a precipitate.

Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l)

Ca(NO₃)₂(aq) + NaOH (aq)→ Ca(OH)₂(s) + NaNO₃(aq)

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock