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What is Equivalence Point?

Important Questions on Acids, Bases and Salts

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

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

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

Number of moles of dichromate needed to oxidise one mole of

{Sn}^{2 +}

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

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

EASY

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : An aqueous solution of $KOH$ when for volumetric analysis, its concentration should be checked before the use.

Reason (R) : On aging, $KOH$ solution absorbs atmospheric ${CO}_{2}$ .

In the light of the above statements, choose the correct answer from the options given below.

MEDIUM

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

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?

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

$20 mL$ of $0.02 M$ hypo solution is used for the titration of $10 mL$ of copper sulphate solution, in the presence of excess of $KI$ using starch as an indicator. The molarity of ${Cu}^{2 +}$ is found to be $_____\times 10^{- 2} M$ (nearest integer)

Given : $2 {Cu}^{2 +} + 4 I^{-} \to {Cu}_{2} I_{2} + I_{2} I_{2} + 2 S_{2} O_{3}^{- 2} \to 2 I^{—} + S_{4} O_{6}^{- 2}$

MEDIUM

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

By the reaction of aqueous

{NaHCO}_{3}

, with which of the following compounds

{CO}_{2}

, is produced?

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

The Plot of

pH

-metric titration of weak base

{NH}_{4} OH

vs strong acid

HCl

looks like

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

0.4 g

mixture of

NaOH, {Na}_{2} {CO}_{3}

and some inert impurities was first titrated with

\frac{N}{10} HCl

using phenolphthalein as an indicator,

17.5 mL

HCl

was required at the end point. After this methyl orange was added and titrated.

1.5 mL

of same

HCl

was required for the next end point. The weight percentage of

{Na}_{2} {CO}_{3}

in the mixture is (Rounded-off to the nearest integer)

MEDIUM

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula

{[Ag {({NH}_{3})}_{2}]}^{+}

per aldehyde group to form silver mirror is ___.(Round off to the Nearest integer)

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

The titration curve of weak acid vs. strong base with phenolphthalein as indicator is shown below. The $K_{phenolphthalein} = 4 \times 10^{- 10}$

Given: $\log 2 = 0.3$

Question Image

The number of following statement/s which is/are correct about phenolphthalein is _______

A. It can be used as an indicator for the titration of weak acid with weak base.

B. It begins to change colour at $pH = 8.4$

C. It is a weak organic base

D. It is colourless in acidic medium

MEDIUM

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

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

MEDIUM

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

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:

MEDIUM

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

2 {KMnO}_{4} + 3 H_{2} {SO}_{4} + 5 H_{2} O_{2} \to K_{2} {SO}_{4} + 2 {MnSO}_{4} + 8 H_{2} O + 5 O_{2}

Find the nonnality of

H_{2} O_{2}

solution, if

20 mL

of it is required to react completely with

16 mL

0.02 {MKMnO}_{4}

solution. ( Molar mass of

{KMnO}_{4} = 158 g {mol}^{- 1}

)

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

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

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

$5 g$ sample contain ${Na}_{2} {CO}_{3} and {Na}_{2} {SO}_{4}$ only. This sample is dissolved and the volume made up to $250 mL .$ $25 mL$ of this solution neutralizes $20 mL, 0.1 M H_{2} {SO}_{4}$ . Calculate the $%$ of ${Na}_{2} {SO}_{4}$ in the sample:

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

40 mL 0.05 M solution of sodium sesquicarbonate dehydrate (Na₂CO₃ . NaHCO₃ . 2H₂O) is titrated against 0.05 M HCl solution, x mL of acid is required to reach the phenolphthalein end point while y mL of same acid were required when methyl orange indicator was used in a separate titration. Which of the following is (are) correct statement (s) ?

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

A mixture of H₂SO₄ and H₂C₂O₄ (Oxalic acid) and some inert impurity weighing 3.185 g was dissolved in water and the solution made up to 1 litre, 10 mL of this solution required 3 mL of 0.1 N NaOH for complete neutralization. In another experiment, 100 mL of the same solution in hot condition required 4 mL of 0.02 M KMnO₄ solution for complete reaction. The wt. % of H₂SO₄ in the mixture was:

MEDIUM

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

20 ml

0.2 M NaOH (aq)

solution is mixed with

35 ml

0.1 M NaOH (aq)

solution and the resultant solution is diluted to

100 ml

40 ml

of this diluted solution reacted with

10 %

impure sample of oxalic acid

(H_{2} C_{2} O_{4})

_.The weight of the impure sample is

HARD

Physical Science>Chemistry>Acids, Bases and Salts>Neutralisation

In a given mixture of ${Na}_{2} {CO}_{3}$ and ${NaHCO}_{3}$ , $x mL HCl$ is required with phenolphthalein indicator and $y mL HCl$ is required with methyl orange indicator for neutralising the mixture. The volume of $HCl$ required for the complete neutralization of ${NaHCO}_{3}$ is

What is Equivalence Point?

Important Questions on Acids, Bases and Salts

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