Why does a pink color appear, and then disappear quickly, at the point where the NaOH solution comes in contact with the solution in the flask?

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources?

Select the most likely product for this reaction: koh(aq) + co2(g) – ? k2co3(aq) + h2o(1) k(s) + h2(g) + o2(g) k(s) + co3(9) +h2