تحضير الخواص الحمضية-الأساسية و دراستها ل α-مونوتيوسيمي كاربازيد ايزاتين 5-سلفونات الصوديوم

الملخص EN

This research aims to prepare organic compounds containing functional groups, and have analytical properties to use as analytical reagents for determination of metal ions by spectrophotometric methods, as acid – base indicators, and as indicators for metal ions in EDTA titrations.

In this paper, was prepared the compound (α –mono thiosemicarbazide isatien – 5 – sodium sulfonate).

It showed analytical properties and significant practical applications.

This compound has in acidic medium yellow color, while in the basic medium sharply changes its color to red color.

The value of pKa of this compound has been calculated by spectrophotometric method and was equal to (8.860 ± 0.054), the pH transition range was between (8.20 to 9.8).

The indicator was used for determination the end point of the titration standard samples of solution (0.1M, NaOH) with standard solution of 0.1M, HCl, and in titration standard samples of solution (0.1M, CH3COOH) with standard solution of 0.1M NaOH.

The results were compared with the results obtained by reference titrimetric methods.

The statistical treatment for all results, shows that the end point determination using acid - base (α - MTI - 5 - SO3Na) is the most accura