QJEEM21Chd9c2: JEE Main 2021 Chemistry - Class 11 JEEM21Chd9c2 Solution: Given below are two statements. Statement I : In the titration…
Given below are two statements.
Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below :
Multiple Choice Options
AStatement I is false but Statement II is true
BStatement I is true but Statement II is false
CBoth Statement I and Statement II are true
DBoth Statement I and Statement II are false
Step-by-Step Verified Solution
Titration curve for strong acid and weak base initially a buffer of weak base and conjugate acid is :
Formed, thus pH falls slowly and after equivalence point, so the pH falls sharply so methyl orange, having pH range of 3.2 to 4.4 will weak as indicator. So, statement I is correct.
Titration curve for weak acid and strong base (NaOH)
Initially weak acid will form a buffer so pH increases slowly but after equivalence point. It rises sharply covering range of phenolphthalein so it will be suitable indicator so statement II is false.
