posted by Jin .
In titration of a 0.10M soln of Na2Co3 with HCL which of the following will be present in the largest concentration at the first equivalence point?
You must recognize what is going on here.
CO3^-2 + H^- ==> HCO3^- + H2O . When the indicator turns at the first equivalence point, this is the reaction that has taken place. Technically, the highest concn will be water; however, that isn't one of the answers. After looking at the equation, you say.......