The strength of an aqueous NaOH solution is most accurately determined by titrating-Note- consider that an appropriate indicator is usedA- Aq- NaOH in a pipette and aqueous oxalic acid in a buretteB- Aq- NaOH in a volumetric flask and concentrated H 2 SO 4 in a conical flaskC- Aq- NaOH in a burette and concentrated H 2 SO 4 in a conical flaskD- Aq- NaOH in a burette and aqueous oxalic acid in a conical flask

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Standard XII

Chemistry

Introduction to Oxidation and Reduction

The strength ...

Question

The strength of an aqueous NaOH solution is most accurately determined by titrating:
(Note: consider that an appropriate indicator is used)

Aq. NaOH in a pipette and aqueous oxalic acid in a burette

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Aq. NaOH in a volumetric flask and concentrated

H_{2} S O_{4}

in a conical flask

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Aq. NaOH in a burette and concentrated

H_{2} S O_{4}

in a conical flask

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Aq. NaOH in a burette and aqueous oxalic acid in a conical flask

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Solution

The correct option is D Aq. NaOH in a burette and aqueous oxalic acid in a conical flask
The standard solution is usually kept in burette. The oxalic acid is a primary standard solution while $H_{2} S O_{4}$ is a secondary standard solution

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Similar questions

5.00 mL

0.10 M

oxalic acid solution taken in a conical flask is titrated against

N a O H

from a burette using phenolphthalein indicator. The volume of

N a O H

required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the

N a O H

solution?

Exp. No.	Vol. of NaOH (mL)
1	12.5
2	10.5
3	9.0
4	9.0
5	9.0

Q. When 1 mole of oxalic acid is treated with excess of NaOH in dilute aqueous silution, 108 kJ of heat is liberated, then the enthalpy of ionisation of the oxalic acid is (Given,

H^{+}

(aq)+

O H^{-}

(aq)

\to

H_{2} O

(I);

△

_neut H = -57.3 kJ)

Q. Even using boiled, distilled water and freshly-opened sodium hydroxide pellets, it is all but impossible to prepare an aqueous solution of

N a O H

with a precisely known concentration. Instead, one prepares a solution that is as close to the desired molarity as possible, then test it against a primary standard, a compound that can be obtained in high purity.

The most common primary standard for analyzing aqueous sodium hydroxide is potassium hydrogen phthalate (

K H P

K H C_{8} H_{4} O_{4} (s)

. The structure of

K H P

is shown in the figure. The acidic hydrogen atom, the one that will react

1 : 1

with

N a O H

, is underlined.

A student conducts an experiment in which she will use

K H P

to standardize a solution of sodium hydroxide. She rinses the burette twice with distilled water, then fills the burette with the

N a O H

solution that she wishes to standardize, taking care to fill the tip of the burette, as well as the barrel.

She records the initial volume of

N a O H

titrant as

0.35 m L

. She weighs an empty

125 - m L

Erlenmeyer flask, then adds a sample of

K H P

to the flask, and weighs the flask and contents.

She adds distilled water to the flask to a depth of about

2 c m

, then swirls the flask to dissolve the

K H P

. Next, she adds

3

drops of phenolphthalein indicator and titrates her first sample.

Which of the following experimental errors will result in a value of the concentration of

N a O H

that is lower than it should be?

Q. What products are formed during, the electrolysis of a concentrated aqueous solution of

N a C l

?
(I)

C l_{2}

(II)

N a O H

(aq)

(III)

H_{2}

(g)

Q. Consider the following balanced chemical equation:

N a O H (a q) + H N O_{3} (a q) \to N a N O_{3} (a q) + H_{2} O (l)

43.55

grams of

N a O H

is present in

1.23 L

of an

N a O H

solution of unknown concentration and mixed with

1.35 L

of a

1.25

molar

H N O_{3}

solution, which of the following is true?

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The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)

The correct option is D Aq. NaOH in a burette and aqueous oxalic acid in a conical flaskThe standard solution is usually kept in burette. The oxalic acid is a primary standard solution while H2SO4 is a secondary standard solution

The strength of an aqueous NaOH solution is most accurately determined by titrating:
(Note: consider that an appropriate indicator is used)

The correct option is D Aq. NaOH in a burette and aqueous oxalic acid in a conical flask
The standard solution is usually kept in burette. The oxalic acid is a primary standard solution while $H_{2} S O_{4}$ is a secondary standard solution