Which indicator works in the pH range of 8 - | vedclass

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Question

(A) The $pH$ range of an indicator is the range over which it changes color. Phenolphthalein is a weak acid indicator that changes color in the basic

Vedclass · Accepted Answer

Phenolphthalein

Vedclass · Answer

(A) The $pH$ range of an indicator is the range over which it changes color. Phenolphthalein is a weak acid indicator that changes color in the basic range,specifically between $pH$ $8.0$ and $9.8$. Methyl orange changes color in the acidic range ($pH$ $3.1 - 4.4$). Methyl red changes color in the acidic range ($pH$ $4.4 - 6.2$). Litmus changes color in the near-neutral range ($pH$ $5.0 - 8.0$). Therefore,the correct indicator for the $pH$ range $8 - 9.8$ is Phenolphthalein.

Which indicator works in the $pH$ range of $8 - 9.8$?

Similar Questions

If a very small amount of $HPh$ (phenolphthalein) is added to a $0.1 \ M$ aqueous solution of $CH_3COONa$,the fraction of the indicator that exists in the colourless form is:
$[K_b(CH_3COO^{-}) = 10^{-9}, pK_a(HPh) = 9.6, \log 2 = 0.3]$

Which indicator is useful for the titration of a weak acid and a strong base?

Given below are two statements :-
Statement $I$ :- Methyl orange is a weak acid.
Statement $II$ :- The benzenoid form of methyl orange is more intense/deeply coloured than the quinonoid form.
In the light of the above statements,choose the most appropriate answer from the options given below :-

The $pH$ range of methyl red indicator is .......?

Phenolphthalein is a suitable indicator for the titration of:

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