Finding the strength of Acetic, Citric, Oxalic acids and Sod.Bicarbonate
Testing Strength of Acetic acid, Hydrochloric acid , Sulphuric acid and Oxalic acid -2
Strength of Citric acid : Eq Wt: 70 Melting Point:153°C
Weigh accurately 0.5 gram of the sample and dissolve in 50 ml of distilled water. Add phenolphthalein indicator and titrate against 0.5N NaOH to a permanent pink color.
% of acid = (Vol of NaOH x N x 70)/(Wt of acid x 10)
Standard Norms : 95 to 98% w/w.
Strength Testing of Hydro Chloric Acid: Mol Wt: = 36.46
Weigh accurately 0.5 gram of the acid and transfer to a conical flask with D.D.water. Add phenolphthalein indicator and titrate against 0.5N NaOH to a permanent pink colour.
% of HCl =
(Vol of NaOH x Normality of NaOH x 36.5) / Weight of HCl x 10
Standard Hydrochloric acid strength will be 29 to 35
Tri Sodium Phosphate: Eq Wt: 82
About 5 grams of dried sample ( heated to 100°C for 2 hours), accurately weighed is dissolved in 50 ml of distilled water. Add 2.5 gram of common salt (vacuum salt) and after to 15°C, the solution is titrated to a distinct red color with 1N HCl, using methyl orange as indicator.
% of T.S.P. = (Vol of HCl X Normality of HCl x 82)/(Wt of the sample x 10)