Paragraph 7 EXPRESSION OF RESULTS

The content of combustible ingredients (C), expressed as carbon, as a percentage by mass of the sample, is given by the formula:

C% = 0.06 \times \frac{V 1 — V 2}{E}

where:

E = the mass in grams of the test portion:
V₁ = the total volume in ml of 0.1 M hydrochloric acid added after the change in colour of the phenolphthalein;
V₂ = the volume in ml of the 0.1 M sodium hydroxide solution used in the titration.