Some Basic Concepts of Chemistry 2 Question 26
26. Statement I In the titration of $\mathrm{Na}{2} \mathrm{CO}{3}$ with $\mathrm{HCl}$ using methyl orange indicator, the volume required at the equivalence point is twice that of the acid required using phenolphthalein indicator.
Statement II Two moles of $\mathrm{HCl}$ are required for the complete neutralisation of one mole of $\mathrm{Na}{2} \mathrm{CO}{3}$.
(1991, 2M)
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Solution:
- Both assertion and reason are factually true but the reason does not exactly explain the assertion. The correct explanation is, methyl orange and phenolphthalein changes their colour at different $\mathrm{pH}$.
