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Posted by on Tuesday, July 27, 2010 at 4:47pm.

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?
a. Co3^2-
b. HCO3-
c. H+
d. H2CO3
e. OH-

  • chemistry - , Tuesday, July 27, 2010 at 5:34pm

    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.......

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