SULPHURIC ACID
INTRODUCTION:
Sulfuric acid is used in cooling towers for lowering the pH of circulation water. PRINCIPLE:
The concentration of acid is determined by titrating its known weight with standard sodium hydroxide solution using methyl orange as indicator. REAGENTS:
1.
2.
Standard Sodium Hydroxide Solution (1.0 N): Dissolve 40 grams of Sodium Hydroxide in 1000 ml of polished water. Methyl Orange lndicator: Dissolve 0.1 grams of Methyl Orange in 100 mlof polished water.
APPARATUS:
Conicalflask, weighing bottle, pipette, burette, balance and wash bottle. PROCEDURE:
1. 2. 3. 4,
Weigh accurately 1.59m to 2.09m of sample in a weighing bottle. Transfer the weighing bottle into a 250 ml conical flask containing about 100 ml polished water, Add 2-4 drops of Methyl Orange indicator and shake. Titrate with standard 1,0 N NaOH solution to a yellow end point and record the volume of NaOH used.
CALCULATION:
H2SO4('/.w/w) =
Vol.ofNaOHxNxFx4g Wt. of Sample x 10
Where
@
Factor of 1,0 N NaOH N :Normality of Std. NaOH.
F:
Oct . 2011