Acid base indicators are either weak organic acids or weak organic bases. Indicator change colour in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenopthalein is a colour less substance in any aqueous solution with a pH less than `8.3` in between the pH range `8.3` to `10`, transaction of colour (colourless to pink) takes place and if pH of solution is greater than `10`, then solution colour is dark pin. Considering an acid indicator HIn, base `In^(-)` can be represented as : `HIn hArr H^(+) + In^(-)` acidic form basic form pH of solution can be computed as : `pH = pK_(In) + "log" ([In^(-)])/([HIn])` In general, transition of colour takes place in between the pH range `pK_(In) +-1`Which of the following indicator is most suitable for titration of HBr with strong base:A. Phenolphthalein `(8.3 - 10)`B. Bromothymol blue `(6-7.6)`C. Methyl red `(4.2-6.3)`D. Malachite green `(11.4-13)`

Acid base indicators are either weak organic acids or weak organic bas

1.	Acid base indicators are either weak organic acids or weak organic bases. Indicator change colour in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenopthalein is a colour less substance in any aqueous solution with a pH less than `8.3` in between the pH range `8.3` to `10`, transaction of colour (colourless to pink) takes place and if pH of solution is greater than `10`, then solution colour is dark pin. Considering an acid indicator HIn, base `In^(-)` can be represented as : `HIn hArr H^(+) + In^(-)` acidic form basic form pH of solution can be computed as : `pH = pK_(In) + "log" ([In^(-)])/([HIn])` In general, transition of colour takes place in between the pH range `pK_(In) +-1`Which of the following indicator is most suitable for titration of HBr with strong base:A. Phenolphthalein `(8.3 - 10)`B. Bromothymol blue `(6-7.6)`C. Methyl red `(4.2-6.3)`D. Malachite green `(11.4-13)`
Answer» Correct Answer - A

Discussion

No Comment Found

Related InterviewSolutions

100ml of 0.1M `H_(3)PO_(4)` is titrated with 0.05 M NaOH solution till 2nd equivalent point. Then, resultant solution was mixed with 10 ml of 0.5 MHCI solution `K_(1)=10^(-3)M` `K_(2)=10^(-8)M` `K_(3)=10^(-13)M` pH at 2nd equivalent point will be :A. `5.5`B. `10.5`C. `8`D. `7`
The conjugate bas of hydrazoic acid isA. `N_(2)H_(4)`B. `N_(2)H_(5^(+))`C. `N_(3)^(-)`D. `NH_(2)OH`
Calcualte the percentage hydrolysis of `10^(-3)M N_(2)^(o+)H_(5)C1^(Theta)` (hydrazinium chloride), salt contining acid ion conjugate to hydrazine base `(NH_(2)NH_(2)). K_(b)` for `N_(2)H_(4) = 1.0 xx 10^(-6)`.
Calculate the hydrolysis constant `(K_(h))` and degree of hydrloysis `(h)` of `NH_(4)C1` in `0.1M` solution. `K_(b) = 2.0 xx 10^(-5)`. Calculate the `[overset(Theta)OH]` ions in the solution.
A trpical aspirin tablet constains 324 mg of aspirin (acetyl salicylic acid `C_(9)H_(8)O_(4)`) a monoprotic acid having `K_(a)=3.0xx10^(-4)` . What is the degree of dissociation of salt and pH of the solution, if two aspirin tables are dissolved to prepare 300 mL solution in water ?
What is the entropy that takes place in conversion of 1 mol of `alpha-`tin to 1 mol `beta -` tin at `17^(@)C`, 1 atm pressure if enthalpy of transition is 2.90 kJ `mol^(-1)` ?A. `1.0 kJ mol^(-1)`B. `7.32 JK^(-1) mol^(-1)`C. `10JK^(-1)mol^(-1)`D. `100JK mol^(-1)`
We represent various reagents pictorially such that, The relative area of the squars represents the relative volume of the reagents used and the overlapping region represents the relative amount of mixing of the reagents. (Use log 5=0.7,log2=0.3,log3=0.5,`d_(H_2O)=1gml^(-1)`) For a solution represented by Which is/are correct?A. Ph=1B. `alpha` of weak acid =`5xx10^(-4)`C. `alpha` of `H_(2)O=9xx10^(-15)`D. Ph=1.7
Determine the concentration of `NH_(3)` solution whose one litre can dissolve `0.10` mole AgCI. `K_(SP)` of AgCI and `K_(f)` of `Ag(NH_(3))_(2)^(+)` are `1.0xx10^(-10)M^(2)` and `1.6xx10^(7)M^(-2)` respectively.
If `500 ml` of `0.4 M AgNO_(3)` is mixed with `50 ml` of `2 M NH_(3)` solution then what is the concentration of `[Ag(NH_(3))]^(+)` in solution `(K_(t), [Ag_(NH_(3))]^(+) = 10^(3), K_(f_(2)) [Ag(NH_(3))_(2)]^(+)= 10^(4))`A. `3.33 xx 10^(-7) M`B. `3.33 xx 10^(-5) M`C. `3 xx 10^(-4) M`D. `10^(-7) M`
a. Calculate `[Ag^(o+)]` in a solution of `[Ag^(o+)]` in a solution of `[Ag(NH_(3))_(2)^(o+)]` prepared by adding `1.0 xx 10^(-3)mol AgNO_(3)` to `1.0L of 1.0M NH_(3)` solution `K_(f) Ag(NH_(3))_(2)^(o+) = 10^(8)`. b. Calculate `[Ag^(o+)]` which is in equilibrium with `0.15M [Ag(NH_(3))_(2)]^(o+)` and `1.5 NH_(3)`.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment