ACID CORRECTION IN GCV (Sulphuric and Nitric Acid)

In the context of GCV (Gross Calorific Value) testing, acid correction typically refers to the process of neutralizing acidic impurities in the fuel sample before performing the GCV test. This correction is necessary to ensure that the GCV result accurately reflects the true energy content of the fuel, without interference from acid impurities that may contribute to the heat output during the combustion process.

Here’s a possible tagline for acid correction in GCV testing:

“Neutralizing acids, unlocking accurate energy insights.”

Procedure of Acid Correction in GCV

Reagents Required

1. Barium hydroxide solution, c[Ba(OH)2] = 0.05 mol/l, prepared by dissolving 18 g of barium hydroxide, Ba(OH)2.8H2O, in about 1 liter of hot water in a large flask.

2. Sodium carbonate solution, c(Na2CO3) = 0.05 mol/l, prepared by dissolving 5.3 g of anhydrous
   sodium carbonate, Na2CO3, dried for 30 min at 260 °C to 270 °C, but not exceeding 270 °C, in water. Transfer the resulting solution quantitatively to a 1 liter volumetric flask and make up to volume with water.
3. Hydrochloric acid solution (HCL) : 0.1 mol/l. = Diluting 9 ml of hydrochloric acid (ρ = 1.18 g/ml) to 1 L with water.
4. Methyl orange indicator : screened, 1 g/l solution = Dissolve 0.25 g of methyl orange and 0.15 g of xylene cyanole FF in 50 ml of 95 % volume fraction ethanol and dilute to 250 ml with water.
5. Phenolphthalein, 10 g/l solution = Dissolve 2,5 g of phenolphthalein in 250 ml of 95 % volume
   fraction ethanol or 2.5 g of the water-soluble salt of phenolphthalein in 250 ml of water.

PROCEDURE:

1. After Combustion Wash the contents of the bomb into a beaker with distilled water. Make sure that the underside of the bomb head, the electrodes and the outside of the crucible are also washed.
2. Dilute the combined bomb washings to about 100 ml. Boil the washings to expel carbon dioxide and titrate the solution with barium hydroxide solution while it is still hot using the phenolphthalein solution as an indicator and Note down B.R. as V1.
3. Add 20.0 ml of the sodium carbonate solution filter the warm solution and wash the precipitate with distilled water. When cold, titrate the filtrate with the hydrochloric acid solution using the screened methyl orange solution as an indicator & Note down B.R. V2.

CALCULATIONS:
Qs = 15.1 * (V1+V2-20) J/g.
QN= 6.0 * (20.0-V2) J/g.