Which of the following statements is incorrec | vedclass

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(A) Indicator$pH$ rangeMethyl orange$3.2-4.5$Phenolphthalein$8.3-10.5$Indicators are chosen based on the $pH$ range of the equivalence point of the ti

Vedclass · Accepted Answer

Methyl orange may be used for a weak acid vs. weak base titration.

Vedclass · Answer

(A) Indicator$pH$ rangeMethyl orange$3.2-4.5$Phenolphthalein$8.3-10.5$Indicators are chosen based on the $pH$ range of the equivalence point of the titration.$1$. Methyl orange is suitable for titrations where the equivalence point falls in the acidic range $(pH \approx 3-5)$,such as strong acid vs. weak base.$2$. Phenolphthalein is suitable for titrations where the equivalence point falls in the basic range $(pH \approx 8-10)$,such as weak acid vs. strong base.$3$. Both indicators can be used for strong acid vs. strong base titrations because the $pH$ change at the equivalence point is very sharp $(pH \approx 4-10)$.$4$. For weak acid vs. weak base titrations,there is no sharp change in $pH$ at the equivalence point,so no simple indicator is suitable. Therefore,the statement that Methyl orange may be used for a weak acid vs. weak base titration is incorrect.

Which of the following statements is incorrect regarding the use of indicators in acid-base titration?

Similar Questions

For an acid-base indicator,the dissociation constant $K_a = 1.0 \times 10^{-5}$. The indicator is red in acidic form and blue in basic form. What is the $pH$ range required for the color change from $80\%$ red to $80\%$ blue?

For an acid indicator with $K_{in} = 1.0 \times 10^{-5}$, the color change occurs when the concentration of the indicator is $1 \times 10^{-3} \ M$. Find the $pH$ at which the color change occurs.

For which of the following titrations is phenolphthalein the most suitable indicator?

The pink colour of phenolphthalein in an alkaline medium is due to -

Phenolphthalein does not act as an indicator for the titration between

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