Simple technique for preparing any strength volumetric solution,.

 

Today’s topic

Molarity of Concentrated Reagents

Hello friends

Please find below details, for preparing normal or molar solution using the concentrated reagents.

By using this technique sure you can prepare any strength volumetric solution, without any reference. Just remember the simple equation and normality strength of the concentrated reagents. Preparation details provided below the table 

DILUTIONS TO MAKE A 1 MOLAR/NORMAL SOLUTION

Concentrated Reagents	Density	Molarity (M)	Normality (N)	Volume (mL) required to make 1000 mL solution:
				1M	1N
Acetic acid 99.5%	1.05	17.4	17.4	57.5	57.5
Ammonia 35%	0.880	18.1	18.1	55.3	55.3
Ammonia 25%	0.910	13.4	13.4	74.6	74.6
Hydrochloric acid 36%	1.18	11.65	11.65	85.8	85.8
Hydrochloric acid 32%	1.16	10.2	10.2	98.0	98.0
Hydrofluoric acid 40%	1.13	22.6	22.6	44.2	44.2
Nitric acid 70%	1.42	15.8	15.8	63.3	63.3
Perchloric acid 60%	1.54	9.2	9.2	108.7	108.7
Perchloric acid 70%	1.67	11.6	11.6	86.2	86.2
Orthophosphoric acid 85%	1.7	15.2	45.6	65.8	21.9
Sodium hydroxide 47%	1.5	17.6	17.6	56.7	56.7
Sulfuric acid 98%	1.84	18.4	36.8	54.3	27.2

·        For preparing 1Normal or 1Molar solution using the concentrated reagent refers below equation.

·        The, strength of concentrated reagent tabulated in the above table with its purity and density.

·        If Normal or Molar solution to be prepared by weighing the concentrated reagent, in that case do not forgot to apply density correction. 

 

CONSIDER EXAMPLE OF ACETIC ACID

Using 99.5% purity Acetic acid reagent, Preparation details for 1Ltr (1000mL) of normal/ Molar strength solution mentioned below.

 Note

i)                   If purity of Acetic acid is 99.5% the Normality is 17.4

Equation:

N1 x V1 = N2 x V2

 

N1 : Normality of concentrated Reagent. (Concentrated acetic acid 17.4N)

 

V1 : Volume of concentrated reagent required to prepare 1Ltr or 1000mL of 1N or    

                1M strength solution (To be calculated)

 

      N2 :  1N Strength solution to be prepared

 

               V2 :  Total volume of 1N strength solution required.

 

              17.4 x V1 = 1N x 1000

 

         =   1N x 1000

                 17.4

V1 =                57.47 ~ 57.5 mL

 

Inference:

 

57.5mL of  Acetic acid to be mixed and diluted to 1000mL with the water to prepare 1N/1M Strength of acetic acid

Acetic acid is mono basic acid. Hence the molarity and normality for the Acetic acid are same.

 

CONSIDER EXAMPLE OF HYDROCHLORIC ACID

Using 36% purity HCl reagent, Preparation details for 1Ltr (1000mL) of normal/ Molar strength solution mentioned below.

 

Note

i)                If purity of HCl is 36% the Normality is 11.65

       

  

N1 x V1 = N2 x V2

 

N1          : Normality of concentrated Reagent. (Concentrated HCl 11.65N)

 

V1          : Volume of concentrated reagent required to prepare 1Ltr or 1000mL of 1N or    

                           1M strength solution (To be calculated)

 

      N2             :  1N Strength solution to be prepared

 

               V2             :  Total volume of 1N strength solution required.

 

11.65 x V1 = 1N x 1000

 

         =   1N x 1000

                 11.65

V1 =                85.83 ~ 85.8 mL

 Inference:

 85.8mL of  Hydrochloric acid to be mixed and diluted to 1000mL with the water to prepare 1N/1M Strength of hydrochloric acid

The normality and molarity for the hydrochloric acid are same.

 

 Using 32% purity HCl reagent, Preparation details for 1Ltr (1000mL) of normal/ Molar strength solution.

 Note

If purity of HCl is 32% the Normality is 10.2

 

N1 x V1 = N2 x V2

 

N1 : Normality of concentrated Reagent. (Concentrated HCl 10.2N)

 

V1 : Volume of concentrated reagent required to prepare 1Ltr or 1000mL of 1N or    

                1M strength solution (To be calculated)

 

      N2 :  1N Strength solution to be prepared

 

               V2 :  Total volume of 1N strength solution required.

 

10.2 x V1 = 1N x 1000

 

         =   1N x 1000

                 10.2

V1 =                98.03 ~ 98.0 mL

 

Inference:

 98.0mL of  Hydrochloric acid to be mixed and diluted to 1000mL with the water to prepare 1N/1M Strength of hydrochloric acid.  

Hydrochloric acid is mono basic acid. Hence the normality and molarity for the hydrochloric acid are same.

 

CONSIDER EXAMPLE OF SULPHURIC ACID

 

Using 98% purity Sulphuric acid reagent, Preparation details for 1Ltr (1000mL) of normal/ Molar strength solution.

 

N1 x V1 = N2 x V2

 

N1 : Normality of concentrated Reagent. (Concentrated acetic acid 36.8N)

 

V1 : Volume of concentrated reagent required to prepare 1Ltr or 1000mL of 1N or    

                           1M strength solution (To be calculated)

 

      N2 :  1N Strength solution to be prepared

 

               V2 :  Total volume of 1N strength solution required.

 

17.4 x V1 = 1M x 1000

 

         =   1N x 1000

                 36.8

V1 =                27.17 ~ 27.2 mL

  

Inference:

 27.2mL of  Sulphuric acid  to be mixed and diluted to 1000mL within the water to prepare 1N Strength of acetic acid

 The normality and molarity for the sulphuric acid are different.

 1M Sulphuric acid

 As Sulphuric acid is dibasic acid hence for preparing 1M solution 27.17x2 = 54.3mL of Sulphuric acid to be mixed and diluted to 1000mL within the water.

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