Determination of the Relative Molecular Mass of Amidosulphuric Acid

NAME : ZULHAIRI BIN MAMAT
DATE : 24 AUGUST 2011
TITLE OF EXPERIMENT : DETERMINATION OF THE RELATIVE MOLECULAR MASS OF AMIDOSULPHURIC ACID

DATA COLLECTION AND PROCESSING.

QUANTITATIVE DATA
Type equation here. Experiment | Burette reading / cm3 | Volume of solution used(±0.1 cm3) | | Initial reading(± 0.05 cm3) | Final reading(± 0.05 cm3) | | 1 | 0.00 | 24.70 | 24.7 | 2 | 18.20 | 48.00 | 29.8 | 3 | 6.00 | 33.00 | 27.0 |

QUALITATIVE DATA

1. When amidosulphuric acid was diluted with distilled water, the beaker feel cold. 2. When the phenolphthalein indicator was dropped into the solution, the solution colour does not change and remain clear. 3. When the diluted amidosulphuric acid was titrated with the sodium hydroxide solution, the colour of the solution turns to pale pink and it is called as end point.

Mass of amidosulphuric acid powder = 2.5050 g ± 0.0001 g

CALCULATION

Average volume of sodium hydroxide solution used =
=First reading+Second reading+Third reading3 =24.7 + 29.8 + 27.0 3 = 27.2 cm3 = 27.2 cm3 ± 0.1 cm3

Chemical equation :
H3NSO3 + NaOH → NaH2NSO3 + H2O

No of mole of sodium hydroxide, n=Molarity of solution ×Volume of solution1000 = 0.1 × 27.21000 = 0.002720 mol

1 mole of NaOH react with 1 mole of H3NSO3
So, 0.002720 mol of NaOH react with 0.002720 mol of H3NSO3

Molarity of 250 cm3 amidosulphuric acid , M=1000 ×No