If we need to make a solution of acetate ion why can we not just mix the ion directly into water? Why do we have to mix an acetate-containing salt (like NaC2H3O2) in water instead?

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Is 343 in the sequence -5, -2, 1, 4, 7

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?