JEE Main · 2019 · 09 Apr 2019 · Shift 2 · Equilibrium

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In an acid - base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the change of pH of the titration mixture in this experiment?

(A)(a)
(B)(c)
(C)(d)
✓ Correct
(D)(b)

Answer: (C)

Solution

Here a strong acid, HCl, is run into a strong base, NaOH. The flask begins strongly basic, so the pH starts high, near

13

. As acid is added the pH eases down, then drops almost vertically through

7

at the equivalence point, and finally levels off at a low value once excess HCl makes the mixture acidic. The curve that starts high, falls sharply through neutrality, and then flattens out low is the one that describes this titration.

JEE Main · 2019 · 09 Apr 2019 · Shift 2 · Single correct option

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