The equivalence point of a titration of a weak base with strong acid is 624 and

Question

The equivalence point of a titration of a weak base with strong acid is 624 and the titration curve drops steeply from pH 7 to 5. Which of the following indicators will not be suitable for this titration? methyl red, pH transition range 3.8-5.4 bromocresol purple, pH transition range 5.2-68 cresol purple. pH transition range 7.6-9.2 p-nitrophenol pH transition range 5.6-7.6 chlorophenol red, pH transition range 4.8-6.4 For EDTA titrations the titration reaction is M + EDTA = MY^n + 4 Which statements are true for EDTA titration curves? At the equivalence point, there is exactly as much EDTA in solution as metal- [M" is calculated from the dissociation of MY^n + 4 formed. After the equivalence point, the concentration free EDTA s excess EDTA and virtually equal all metal ion is in the form MY^n + 4 [M^n+] 1 is calculated from the dissociation of MY^n + 4 Before the equivalence point, free [M^n+] equals excess unreacted M^n+ after EDTA has been consumed. Dissociation of MY^n - 4 is negligible. conditional formation constants, Kr is pH independent. I. II and III I, III, and IV I, II, III, and IV II, III, and IV

Explanation / Answer

7) Cresol purple pH range 7.6 to 9.2 cannot be used for this transition as the transition range of this indicator doesnot lie within the range of the reaction from 7 to 5

Answer is (C)

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