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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

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The correct Answer is:
D
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What indicators will be suitable for the following acid-base titrations: a. HCOOH against NaOH b. HBr against KOH c. NH_(4)OH with HNO_(3)

Statement 1: Methyl orange is suitable indicator for titration of strong acid and weak base Statement 2: Phenolphthalein is not suitable indicator for titration of acetic acid and NaOH

Knowledge Check

  • During neutralisation of an acid by a base, the end point refers for 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 (Phenolphthlein) or a weak base (Mrthyl orange). At about 50% ionisation which depends on the medium, the anion furnished by an indicator (acid) or cation furnished by indicator (basic) imparts its characteristic colour to solution at point. For example phenolphthalein, the dissociation is underset("Colourless")(H In hArr H^(+))+underset("Pink")(In^(-)), K_(H In)= ([H^(+)][In^(-)])/([H In]) favoured in presence of alkali and pink colour of phenolphalein ion is noticed as soon as the medium changes to alkaline nature. The end point of acid-base neutralisation not necessarily coincides with equivalent point but it is closer and closer to equivalence point. Also at equivalence point of acid-base neutralisation pH is not necessarliy equal to 7. Which of the following statements are correct ? (1) Phenolphthalein is not a good indicator for weak alkali titrations (2) Phenolphthalein does not give pink colour with weak alkalies as NH_(4)OH (3) Phenolphthalein is an acid indicator and imparts colour in basic medium (4) Phenolphthalein is a basic indicator and imparts colour in basic medium (5) Phenolphthalein furnishes coloured cation

    A
    `1,2,4,5`
    B
    `1,2,3,4`
    C
    `1,3`
    D
    `2,4`

  • 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.

    A
    P,Q,S and T
    B
    P,Q,R and S
    C
    P and R
    D
    Q and S

  • 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

    A
    P,Q,R,S and T
    B
    P,R,S and T
    C
    P,S and T
    D
    P,Q,R and T

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    End point//equivalence point of how many of the following titrations cannot be detected with the indicators given against them? {:(,"Titration","Indicator"),(i,KOH+HCN,"Methyl orange"),(ii,NaOH+HF,"Hin"(K_("In")=3xx10^(-4))),(iii,HNO_(3)+Sr(OH)_(2),"Phenol red"),(iv,HCIO_(4)+"Aniline","Methyl red"),(v,HCl+"Dimethyl amine","Hin"(K_("In")=5xx10^(-5))),(v,Ba(OH)_(2)+HNO_(2),"Phenolphthalein"),(vii,NaH_(2)PO_(2)+H_(2)SO_(4),InOH(K_("In")=3xx10^(-5))),(viii,"Pyridine"+"Benzoic acid","Phenol red"),(ix,KH_(3)BO_(3)+HI,"Methyl red"):}

    {:(,"Column I(Types of titration)",,"Column II (Indicator used)",),((A),"Strong acid vs strong base",(p),"Methyl orange",),((B),"Strong acid vs weak base",(q),"Methyl red",),((C),"Weak acid vs strong base",(r),"Phenolphthalein",),((D),"Weak acid vs weak base",(s),"Bromothymol blue",):}

    A solution gives the following colours with different indicators: a. Methy 1 orange rArr Yellow b. Methy 1 red rArr Yellow c. Bromothymol blue rArr Orange What is the pH of the solution?

    Select the best indicator from the given table for titration of 20 mL of 0.02 M CH_(3)COOH with 0.02 M NaOH. Given pK_(a) (CH_(3)COOH)=4.74 {:(,"Indicator","pH range"),((I),"Bromothymol blue",6.0-7.6),((II),"Thymolphthalein",9.3-10.5),((III),"Malachite green",11.4-13),((IV),"M-Cresol purple",7.4-90):}

    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

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