HARD

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A sample of hard water has its hardness due to ${MgSO}_{4}$ only. When this water is passed through anion exchange resin, ${SO}_{4}^{2 -}$ ions are replaced by ${OH}^{-}$ . $25 ml$ of hard water sample so treated require $20 ml$ of $10^{- 3} M H_{2} {SO}_{4}$ . What is hardness of water expressed in term of $ppm$ of ${CaCO}_{3}$ ?

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Important Questions on Solutions

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

A mixture has

18 g

of water and

414 g

of ethanol. The mole fraction of water in the mixture is (assume ideal behaviour of the mixture)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

3 \cdot 42 \times 10^{- 2} kg

Sugar (molar mass

342

) is dissolved in water to produce

234.2 g

of sugar syrup, what is the molality of sugar syrup ?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

3.0 g

of oxalic acid

[{({CO}_{2} H)}_{2} \cdot 2 H_{2} O]

is dissolved in a solvent to prepare a

250 mL

solution. The density of the solution is

1.9 g / mL

. The molality and normality of the solution, respectively, are closest to

HARD

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

A $6.50$ molal solution of $KOH (aq .)$ has a density of $1.89 g {cm}^{- 3}$ . The molarity of the solution is $mol {dm}^{- 3}$ . (Round off to the Nearest Integer).

[Atomic masses: $K : 39.0 u; O : 16.0 u; H : 1.0 u$ ]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

5.2

molal aqueous solution of methyl alcohol,

{CH}_{3} OH

, is supplied. What is the mole fraction of methyl alcohol in the solution?

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

4.5 g

of compound

A (M . W . = 90)

was used to make

250 mL

of its aqueous solution. The molarity of the solution in

M

x \times 10^{- 1} .

The value of

x

is_____ (Rounded off to the nearest integer)

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Which of the following factors affect molarity of solution?

HARD

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Density of

3 M

solution of

NaCl

1.25 g / mL .

Calculate the volume of water required to make

1000 mL

of this

NaCl

solution. [Consider the density of water as

1 g / mL] .

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Which of the following statements is true?

$1$ ) $200 mL$ of $0.2 M$ $NaOH$ has a same number of moles of solute as $1000 mL$ of $1 M NaOH$ .
$2$ ) $200 mL$ of $1 M NaOH$ has a same number of moles as $1000 mL$ of $0.2 M NaOH$ .
$3$ ) $100 mL$ of $0.2 M NaOH$ has a same number of moles as $1000 mL$ of $1 M NaOH$ .
$4$ ) $2000 mL$ of $0.2 M NaOH$ has a same number of moles as $1000 mL$ of $1 M NaOH$ .

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Calculate the mass percentage of

3 g

of solute

A

dissolved in

18 g

of water.

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

The mole fraction of a solute in a $100$ molal aqueous solution ________ $\times 10^{- 2} .$

(Round off to the Nearest Integer).

[Given : Atomic masses: $H : 1.0 u, O : 16.0 u$ ]

HARD

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

An antifreeze solution is prepared from

222.6 g

of ethylene glycol

(C_{2} H_{6} O_{2})

and

200 g

of water. Calculate the molality of the solution. If the density of the solution is

1.072 g {mL}^{- 1}

, then what shall be the molarity of the solution?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

The density of

NaOH

solution is

1.2 g {cm}^{- 3} .

The molality of this solution is

m

(Round off to the Nearest Integer):
[Use : Atomic masses :

Na : 23.0 u O : 16.0 u

H : 1.0 u

Density of

H_{2} O : 1.0 g {cm}^{- 3}]

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

When the concentration is expressed as the number of moles of solute per kilogram of the solvent, it is known as;

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Calculate the molarity of a solution of

30 g

Co {({NO}_{3})}_{2} . 6 H_{2} O

4.3 L

of solution ? Consider atomic mass of

Co = 59, N = 14, O = 16, H = 1

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

100 mL

{Na}_{3} {PO}_{4}

solution contains

3.45 g

of sodium. The molarity of the solution is .....

\times 10^{- 2} mol L^{- 1}

. (Nearest integer)
[Atomic Masses -

Na : 23.0 u, O : 16.0 u, P : 31.0 u]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

The molarity of the solution prepared by dissolving

6.3 g

of oxalic acid

(H_{2} C_{2} O_{4} \cdot 2 H_{2} O)

250 mL

of water in

mol L^{- 1}

x \times 10^{- 2} .

The value of

x

is _________ . (Nearest integer)
[Atomic mass :

H : 1.0, C : 12.0, 0 : 16.0 J

]

EASY

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

Molality is defined as

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

A solution of two components containing

n_{1}

moles of the

1^{st}

component and

n_{2}

moles of the

2^{nd}

component is prepared.

M_{1}

and

M_{2}

are the molecular weights of component 1 and 2 respectively. If

d

is the density of the solution in

{gml}^{- 1}, C_{2}

is the molarity and

x_{2}

is the mole fraction of the

2^{nd}

component, then

C_{2}

can be expressed as :

MEDIUM

Chemistry>Physical Chemistry>Solutions>Methods of Expressing Concentration of Solutions

The mass percentage of nitrogen in histamine is ________

A sample of hard water has its hardness due to MgSO4 only. When this water is passed through anion exchange resin, SO42- ions are replaced by OH-. 25 ml of hard water sample so treated require 20 ml of 10-3 M H2SO4. What is hardness of water expressed in term of ppm of CaCO3?

Important Questions on Solutions

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