Do the populations change very much, or are they in equilibrium (stable)? Explain.

I’m really not sure what’s the answer. sorry

The answer is just took the test

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

Ican't see the chart but the density of both nickel and cobalt is 8.90 g/cm3, so it would be one of those.