Redox Titrations Permanganometry Redox Titrations and Permanganometry KMn

Preparation of 1 L 0. 02 M KMn. O 4 Solution • Theoretically, 0.

Next week !! • After waiting one week, filter the solution by glass fibers

Standardization of KMn. O 4 Solution • REFERENCE Analitik Kimya Pratikleri – Kantitatif Analiz

Slides: 7

Download presentation

Redox Titrations Permanganometry

Redox Titrations and Permanganometry •

KMn. O 4 is an autoindicator. •

Preparation of 1 L 0. 02 M KMn. O 4 Solution • Theoretically, 0. 02 mol (3. 1605 g) KMn. O 4 should be dissolved in 1 L of water. However, some of KMn. O 4 will be reduced by organic substances that naturally exist in water. So keep in mind the following remarks: 1. Since some of KMn. O 4 will be lost after reduction, around 0. 1 -0. 2 g more than theoretically required amount of KMn. O 4 should be dissolved in 1 L. 2. Mn. O 2, which is produced because of the organic substances in water, should be removed by filtration because it catalyzes and accelerates the reduction. • Procedure: • Weigh the required amount of KMn. O 4 into a beaker. Add 400 -500 m. L distilled water to the beaker and dissolve the solid KMn. O 4 by mixing with a glass-rod. Transfer the solution to a 1 L volumetric flask. In order to dissolve the remaining solid KMn. O 4, add 100 -200 m. L of distilled water to the beaker and mix it with the glass-rod. Transfer the solution into the same flask. Repeat this step until all the solid KMn. O 4 in the beaker is dissolved. (Be careful! Do not add more water than 1 L in total). • Fill the flask up to the 1 L mark with distilled water. Shake the volumetric flask to make sure all the KMn. O 4 is dissolved in the flask. Put the solution into an amber-color bottle and keep it in dark for 1 week.

Next week !! • After waiting one week, filter the solution by glass fibers into a clean amber glass bottle. The final solution should be kept in dark. • During the week, almost all the organic substances would be oxidized and some Mn. O 2 would be present in the solution. The solid Mn. O 2 is filtrated by glass fibers (The cellulose in filter paper would react with KMn. O 4) • The final solution is kept in dark to avoid photoreduction.

Standardization of KMn. O 4 Solution •

Standardization of KMn. O 4 Solution • REFERENCE Analitik Kimya Pratikleri – Kantitatif Analiz (Ed. Feyyaz ONUR), A. Ü. Eczacılık Fakültesi Yayınları No. 111, 2014.