Forrester, Stanley D.

2018-09-13T15:54:49Z

2018-09-13T15:54:49Z

1929

1. Crocein and G salts brominate extremely slowly in sulphuric acid solution, whereas Schaffer and R salts brominate readily.

2. The addition of a large excess of potassium bromide previous to titration with bromate solution decreases the rate of bromination of Crocein salt.

3. The temperature must not exceed 50 °, when titrat -' ing in hydrochloric acid solution, owing to dibromination of all four salts to a slight extent above 50°.

4. Schäffer or /and R salt can be determined in the presence of Crocein or /and G salt by taking advantage of the different rates of bromination in sulphuric acid.

5. The total sulphonate content of mixtures containing Schäffer or /and R salts and G salt can bedetermined.

6. The total sulphonate content of mixtures contain ing Schäffer or R salt and Crocein salt can be determined (but not too satisfactorily).

7. The accuracy of the methods described is about one per cent.

http://hdl.handle.net/1842/32196

The University of Edinburgh

Annexe Thesis Digitisation Project 2018 Block 20

The quantitative estimation of certain beta-naphthol sulphonic acids singly and in presence of one another

Thesis or Dissertation

Doctoral

PhD Doctor of Philosophy