Answer / soma sekhar.a

By using 100 mg of sodium carbonate in 100ml of water,methyl
orange as an indicator.


Normality of 0.1N HCl=wt of Na2Co3*0.01/Vol.of 0.1N HCl*.0053

Answer / bhushan

1)Dissolve exactly 0.53 g of the sodium Carbonate in 20ml of distilled water.
2)Dilute to 100ml . Transfer 10ml of this 0.1N sodium carbonate solution to a 125 ml Erlenmeyer flask.
3)Add few drops methyl orange indicator.
4)Titrate approximately 0.1 N HCl solution into sodium carbonate.
END POINT :- Yellow to Reddish Brown
5) Boil the solution gently for 1min.and them cool at RT by runningtap water over the out side of the flask.If colour changes back to.
orange, titrate more HCl untill the first faint but permanent reddish
brown colour appears in the solution.

Calculations : -
-----------------

0.1 X 10
Normality of HCl = --------------------------
(B.R.) ml. of HCl ti

Answer / nilesh soni

2 gm Anhyd. Na2Co3 + 150 ml H20 + 4-5 drops Methyl Orange
indicator & titrate with HCl & Colour change is Yellow to
Slight Pink.
Wt of Na2Co3 x 1000
Formulla = -------------------------
B.R x 53

Answer / abdulkalim

Standardization of 0.1 N HCl:
----------------------------

Weigh accurately 0.5 g of tromethamine which is previously
dried at 105° C for 3 hours add 50 mL of water and add 2
drops of bromocresol green indicator and titrate against
0.1 N HCl to pale yellow end point.(As per USP)

Formula = wt of tromethamine (mg)
________________________
121.14 X mL of HCL

Answer / asam

same as Ans #2

Answer / vinish katkar

same as ans 5

Answer / shivalal banoth

For 0.1 N/M Hcl by dissolving 100 mg of sodium carbonate in 20 mL of water

M=100 mg/titer value X 0.1/ Factor(5.30 mg)

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