Calculate normality of solution, containing 4 gm NaOH in 250 ml aqueous solution.

Normality is defined as the number of gram or mole equivalents of solute present in one litre of a solution. We know that molar mass of NaOH is 40 . Gram equivalent of NaOH = 4 40 = 1 10 Normality can be calculated by using the formula; N = Gram equivalent volume of the solution N = 1 10 250 1000 = 1 10 × 1000 250 = 0 . 4 N

50 ml of N 10 NaOH solution, 100 ml of N 5 NaOH solution and 500 ml of N 2 NaOH solution are mixed together. What is the strength of the resultant solution?

Given: The volumes of the solutions are V 1 = 50 ml , V 2 = 100 ml and V 3 = 500 ml . So, the volume of the resultant solution is V = 50 + 100 + 500 = 650 ml . The normality of the solutions are N 1 = 1 10 , N 2 = 1 5 and N 3 = 1 2 . If the strength of the resultant solution is N , then ⇒ NV = N 1 V 1 + N 2 V 2 + N 3 V 3 ⇒ N × 650 = 1 10 × 50 + 1 5 × 100 + 1 2 × 500 ⇒ N × 650 = 5 + 20 + 250 ⇒ N = 275 650 = 0 . 423 The strength of the resultant solution is 0 . 423 N .

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Concentrated $H C l$ is $10 N$ , 1000 cc of $1 N$ $H C l$ can be obtained by diluting

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

The mole fraction of urea in an aqueous urea solution containing

900 g

of water is

0.05

. If the density of the solution is

1.2 g {c m}^{- 3}

, the molarity of urea solution is _______. (Round off the answer to the nearest decimal)
(Given data: Molar masses of urea and water are

60 g {m o l}^{- 1}

and

18 g {m o l}^{- 1}

, respectively)

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

The molarity of a solution obtained by mixing

750 mL

0.5 (M) HCl

with

250 mL

2 (M) HCl

will be

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The mass percentage of nitrogen in histamine is ________

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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 $1 M NaOH$ .

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

Find the normality of sodium bicarbonate solution containing

8.4 g

{NaHCO}_{3}

250 ml ?

(Equivalent weight of

{NaHCO}_{3} = 84 g . {eq}^{- 1}

)

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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?

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The molarity of

{H N O}_{3}

in a sample which has density

1.4 g / m L

and mass percentage of

63 %

is ________ (Molecular Weight of

{H N O}_{3} = 63

)

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

Which of the following factors affect molarity of solution?

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

4.9 g

H_{2} {SO}_{4}

is present in

100 mL

solution. The molarity and normality of the solution will be

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

Calculate normality of solution, containing

4 gm

NaOH

250 ml

aqueous solution.

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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.

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How many grams of ${Cl}_{2}$ gas will be obtained by the complete reaction of $31.6 gm$ of potassium permanganate with hydrochloric acid?

$[Mole mass of {KMnO}_{4} = 316 gm / mol]$

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

Molality is defined as

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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 :

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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 ?

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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)

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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

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50 ml

\frac{N}{10} NaOH

solution,

100 ml

\frac{N}{5} NaOH

solution and

500 ml

\frac{N}{2} NaOH

solution are mixed together. What is the strength of the resultant solution?

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

0.63 g

of Oxalic acid is dissolved in order to obtain

250 {cm}^{3}

of its solution. Find the normality of this solution. [Oxalic acid:

(COOH)_{2} \cdot 2 H_{2} O]

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

What is the normality of aqueous solution of

H_{2} {SO}_{4}

having

pH = 1 .

Concentrated HCl is 10 N , 1000 cc of 1N HCl can be obtained by diluting

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Concentrated $H C l$ is $10 N$ , 1000 cc of $1 N$ $H C l$ can be obtained by diluting