Chapter 149 of 2363 min read

Titrimetric analysis and salt analysis

Why this is asked: Indicator choice depends on where the equivalence point's pH actually falls: phenolphthalein suits weak acid–strong base titrations (equivalence point is basic), methyl orange suits strong acid–weak base (equivalence point is acidic), and either works for strong acid–strong base. Reaching for phenolphthalein out of habit on a strong-acid–weak-base titration — where the colour change happens well past the actual equivalence point — is exactly the error this tests.

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Test yourself

•Match List I with List II.
List I (Ion) List II (Group number in cation analysis)
A. $C o^{2 +}$ I. Group I
B. $M g^{2 +}$ II. Group III
C. $P b^{2 +}$ III. Group IV
D. $A l^{3 +}$ IV. Group VI
Choose the correct answer from the options given below:
•During the preparation of Mohr's salt solution (ferrous ammonium sulphate), which of the following acids is added to prevent hydrolysis of the $F e^{2 +}$ ion?
•Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI. A. $A l^{3 +}$ · B. $C u^{2 +}$ · C. $B a^{2 +}$ · D. $C o^{2 +}$ · E. $M g^{2 +}$ Choose the correct answer from the options given below:

List I (Ion)	List II (Group number in cation analysis)
A. $C o^{2 +}$	I. Group I
B. $M g^{2 +}$	II. Group III
C. $P b^{2 +}$	III. Group IV
D. $A l^{3 +}$	IV. Group VI

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