EASY

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A $100 m l$ solution of $0.1 N H C l$ was titrated with $0.2 N N a O H$ solution. The titration was discontinued after adding $30 m l$ of $N a O H$ solution. The remaining titration was completed by adding $0.25 N K O H$ solution. The volume of $K O H$ required for completing the titration is

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Important Questions on Equilibria

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

The Plot of

pH

-metric titration of weak base

{NH}_{4} OH

vs strong acid

HCl

looks like

EASY

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

Incorrect statement for the use of indicator in acid-base titration is:

EASY

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

100 mL

0.1 M HCl

is taken in a beaker and to it

100 mL

0.1 M NaOH

of is added in steps of

2 mL

and the

pH

is continuously measured. Which of the following graphs correctly depicts the change in

pH

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

In a complexometric titration of metal ion with ligand

M (M e t a l i o n) + L (L i g a n d) \to C (C o m p l e x)

end point is estimated spectrophotometrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs then the titration plot between absorbed light

(A)

versus volume of ligand 'L'

(V)

would look like:

MEDIUM

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

Given below are two statements:
Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with $\mathrm{NaOH}$ phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

A compound '

X

' is a weak acid and it exhibits colour change at

pH

close to the equivalence point during neutralization of

NaOH

with

{CH}_{3} COOH

. Compound '

X

' exists in ionized form in basic medium. The compound '

X

' is

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

In an acid-base titration,

0.1 M H C l

solution was added to the

N a O H

solution of unknown strength. Which of the following correctly shown the change of

p H

of the titration mixture in this experiment?
Question Image

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

In base vs. Acid titration, at the end point methyl orange is present as

MEDIUM

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

An alkali is titrated against acid with methyl orange as an indicator, which of the following is a correct combination?

MEDIUM

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

50 mL

0 .5 M

oxalic acid is needed to neutralize

25 mL

of sodium hydroxide solution. What is the amount of

NaOH

50 mL

of the given sodium hydroxide solution?

EASY

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

100 m L

of a mixture of

N a O H

and

{N a}_{2} {S O}_{4}

is neutralized by

10 m L

0.5 M H_{2} {S O}_{4}

. The amount of

N a O H

100 m L

solution is -

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

40 mL

sample of mixture of

HCl

and

H_{3} {PO}_{4}

was titrated with

0.10 M NaOH

. The first equivalence point was reached after

88 mL

of a base was added and the second equivalence point was reached after

128 mL

of a base was added. The ionization constant of

H_{3} {PO}_{4} (K_{a 1}) = 7.5 \times 10^{- 3}

.
(i) What are the initial concentration of

HCl

and

H_{3} {PO}_{4}

?
(ii) What is the

pH

at the first equivalence point?
(iii) What is the

pH

of the mixture before any base is added?

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

The curve in the figure shows the variation of the

pH

during the course of the titration of a weak acid

HA

, with a strong base (

NaOH

). At which point in the titration curve is the concentration of the acid equal to that of its conjugate base?

Question Image

MEDIUM

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

4.08 g of a mixture of BaO and unknown carbonate MCO₃ was heated strongly. The residue weighed 3.64 g. This was dissolved in 100 mL of 1 N HCl. The excess acid required 16 mL of 2.5 N NaOH solution for complete neutralisation. Identify the metal M.

MEDIUM

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

The equivalent masses of

N a_{2} C O_{3}

when it is titrated with

H C l

using phenolphthalein and methyl orange separate experiments are

MEDIUM

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

Titration curves for $0.1 M$ solutions of three weak acids $HA, {HA}_{2}$ and ${HA}_{3}$ with ionization constants $K_{1}, K_{2}$ and $K_{3}$ respectively are plotted as shown in the figure. Which of the following is/are true?

Question Image

HARD

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

Which one is the correct graph (figure) for the corresponding acid base titration?

MEDIUM

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

A solution contains Na₂CO₃ and NaOH with Phenolphthalein as indicator, 25 mL of a mixture requires 19.5 mL of 0.005 N HCl for the end point. If methyl orange is indicator, then 25 mL of solution requires 25.9 of the same HCl for end point. Then concentration of NaOH substance in original solution is:

EASY

Chemistry>Physical Chemistry>Equilibria>Indicators and Acid-base Titrations

The titration curve for titration of a $50 mL$ solution of a diprotic acid with $0.1 M NaOH$ is shown below.

Question Image

$K_{a 1}$ and $K_{a 2}$ are approximately

A 100 ml solution of 0.1 N HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 ml of NaOH solution. The remaining titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is

Important Questions on Equilibria

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A $100 m l$ solution of $0.1 N H C l$ was titrated with $0.2 N N a O H$ solution. The titration was discontinued after adding $30 m l$ of $N a O H$ solution. The remaining titration was completed by adding $0.25 N K O H$ solution. The volume of $K O H$ required for completing the titration is