Principle:
Standard solutions are those solutions which contains known weight of reagent in a definite volume of solution. Most of the standard solutions are prepared by dissolving weight amount of solid and adding sufficient water to make the desired volume. We must determine how much solid to weight out to prepare a given volume of solution of a given strength.
Apparatus and Chemical: 1.Digital balance, wash bottle, Distilled water, Sodium Carbonate (Na2CO3), Volumetric flask etc.
Preparation of Sodium Carbonate (Na2CO3): I wanted to prepare 100ml of 0.1N Solution. So, we Calculate the concentration like this way.
Molecular weight of Na2CO3 = 23*2+12+16*3 =106
Equivalent weight of Na2CO3 = 106/2 = 53
So In 1000ml of 1N Na2CO3 present = 53g
1 1N =53/1000g
100 0.1N =(53*100*0.1)/1000g = 0.53 g
Concentration of Na2CO3 = wt. taken /wt. to be taken X desired conc.
= 0.53 / 0.53 X 0.1 N
= 0.1 N
Procedure:
1. At first taken weight out 1.325g of Na2CO3 with the help of a digital balance.
2. The Volumetric flask cleaned with distilled water.
3. placed the funnel on the top of the Volumetric flask and then into weighted amount of Na2CO3.
4. slowly run the Distilled water over the funnel and shake the flak until mixed properly.
5.Finally the Distilled water was poured in to the flask up to the mark to make a 250ml solution
Result: The exact concentration of preparation of the Na2CO3 solution is 0.1N.
