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Chapter 12: Q25P (page 285)

Calcium ion was titrated with EDTA at pH 11, using Calmagite as indicator (Table 12-3). Which is the principal species of Calmagite at pH 11? What color was observed before the equivalence point? After the equivalence point?

Short Answer

Expert verified

The principal species of Calmagite at pH 11 will be HIn2 Wine color was observed before the equivalence point and blue color was obtained after the equivalence point

Step by step solution

01

Information given

A titration reaction between calcium ion and EDTA at pH 11 in presence of calmagite indicator. is as follows

颁补螜苍+EDTA鈫�CaEDTA+螜苍WineRedColorlessColorlessBlue

02

How the reaction proceeds

Little amount of indicator is induced at the beginning of the experiment. It is added to the colorless Ca2+complex and forms a red complex. After that EDTA is added. This reacts with the Ca2+ solution first.After completion of reaction between Ca2+ and EDTA, the remained indicator sample reacts with EDTA and turns into blue unbound .

03

Reason

The principal species of Calmagite at pH 11 will be HIn2-Wine color was observed before the equivalence point and blue color was obtained after the equivalence point.

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Most popular questions from this chapter

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