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Which indicator is suitable for the titr...

Which indicator is suitable for the titrations:
`{:("Titration",,"Indicator",,),(i.HCOOH//NaOH,,(A)"Bromothymol blue or phenolphtalein or methy1 orange or thymolphthalein.",,),(ii.HBr//KOH,,(B)"Methy1 orange or methy1 red or bromocresol green",,),(ii.NH_(4)OH//NHO_(3),,(C)"Phenolphthalein or thymolphtalein",,):}`

A

`(i) rarrA, (ii) rarr B, (iii) rarr C`

B

`(i) rarrA,(ii) rarr C,(iii) rarr B`

C

`(i) rarrB,(ii) rarr C,(iii) rarr A`

D

`(i) rarr C, (iii) rarr A, (iii) rarr B`

Text Solution

Verified by Experts

The correct Answer is:
D
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During the neutralisation of an acid by a base, the end point refers to the completion of reaction. The detection of end point in acid-base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthalein) or a weak base (Methyl orange). At 50% ionisation which depends on the medium. the anion furnished by an indicator (acid) cation furnished colour to solution at end point. For example, phenolphthalein dissociation underset("Colourless")(HIn)toH^(+)+underset("Pink")(In^(-)),K_(HIn)=([H^(+)][In^(-)])/([HIn]) is favoured in presence of alkali and pink colour of phenolphthalein ion is noticed as soon as the medium changes to alkali nature. The end point of acid-base neutralisation not necessarily coincides with eqivalence point but it is closer to equivalence point. Also at equivalence point of acid-base neutralisation, pH is not necessarily equal to 7. Which of the following statements are correct? (P) Phenolphthalein is not a good indicator for weak alkali titrations. (Q) Phenolphthalein does not give pink colour with weak alkalies as NH_(4)OH (R) Phenolphthalein is an basic indicator and imparts colour in basic medium.

During the neutralisation of an acid by a base, the end point refers to the completion of reaction. The detection of end point in acid-base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthalein) or a weak base (Methyl orange). At 50% ionisation which depends on the medium. the anion furnished by an indicator (acid) cation furnished colour to solution at end point. For example, phenolphthalein dissociation underset("Colourless")(HIn)toH^(+)+underset("Pink")(In^(-)),K_(HIn)=([H^(+)][In^(-)])/([HIn]) is favoured in presence of alkali and pink colour of phenolphthalein ion is noticed as soon as the medium changes to alkali nature. The end point of acid-base neutralisation not necessarily coincides with eqivalence point but it is closer to equivalence point. Also at equivalence point of acid-base neutralisation, pH is not necessarily equal to 7. Which among the followig statements are correct? (P) At equivalence point of NaOH AND HCI,pH=7 (Q) At equivalence point of NaOH and CH_(3)COOH,pH gt 7 (R) At equivalence point of NH_(4)OH and HCI,pH lt 7 (S) An indicator shows best results if equivalence point is within the pH range pK_(In)pm1 (T) ) At equivalence point of NH_(4)OH and formic acid pH lt 7

There are three acid-base indicators. Methyl orange (end point at pH=4 ), bromothymol blue (end point at pH-7 ), phenolphthalein (end point at pH=9 ). Which is the most suitable indicator for the following titrations? (a). H_2SO_4 with KOH (b). KCn with HCl (c). NH_3 with HNO_3 (d). HF with NaOH

CENGAGE CHEMISTRY-IONIC EQUILIBRIUM-Ex 8.4
  1. The following pH range where the indicator shows change in colour are ...

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  2. The following acid base titration graphs are given: (I) Which of ...

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  3. Which indicator is suitable for the titrations: {:("Titration",,"Ind...

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  4. A solution gives the following colours with different indicators: a....

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  5. In the titration of NH(4)OH versus HC1, the pH of the solution at equi...

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  6. The pH indicators are

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  7. In which of the following acid-base titration, the pH is greater than ...

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  8. Strong acids are generally used as standard solution in acid-base titr...

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  9. The best indicator for detection of end point in titration of a weak a...

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  10. The precipitate of CaF(2) (K(sp)=1.7xx10^(-10)) is obtained when equal...

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  11. The solubility of A(2)B(3) is "x mol dm"^(-3). Its K(sp) is

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  12. The pH of Ca(OH)(2) is 10.6 at 25^(@)C. K(sp) of Ca(OH)(2) is

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  13. Solubility of AgI in 0.05M BaI(2) solution is 10^(-15)M. The solubilit...

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  14. Solubility of a solute in water is dependent on temperature as given b...

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  15. The solubility of CaF(2) in a solution of 0.1M Ca(NO(3))(2) is

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  16. The volume of water needed to dissolve 1mg of PbSO(4) (K(sp) = 1.44 xx...

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  17. The volume of water needed to prepare a satured solution of Ag^(o+) ha...

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  18. How many grams of KBr can be added to 1L of 0.12 M solution of AgNO(3)...

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  19. The solubility of silver benzoate (C(6)H(5)COOAg) in H(2)O and in a bu...

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  20. The solubility of CH(3)COOAg in a buffer solution with pH = 4, whose K...

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