How will you known that you have reached the equivalence point when titrating the NaOH solution with HCl?

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kali98911 kali98911

03-12-2019
Chemistry

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How will you known that you have reached the equivalence point when titrating the NaOH solution with HCl?

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Giangiglia Giangiglia · Answer 1 · 2019-12-03T15:11:05+01:00

Answer:

When the solution (with phenolphthalein) changes to colorless

Explanation:

When titrating with HCl is common to add phenolphthalein as an acid-base indicator.

Phenolphthalein is pink or fucsia when added into a basic solution. On the other hand when it is in acid solutions, is colorless.

So, when titrating, the NaOH solution will be initialy pink due to the phenolphthalein and when reaching the equivalence point, that color will fade out into colorless. This is how you know you hace reached the equivalent point.