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Analytical Method of Distinguishing Between the Species of Stannic Ion in the Presence of Stannous Ion

IP.com Disclosure Number: IPCOM000095492D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 18K

Publishing Venue

IBM

Related People

Sankuer, RF: AUTHOR [+2]

Abstract

There is a pH dependent equilibrium between the species of stannic ion as follows: The presence of each species in a given solution of stannic ion is analyzed directly and quantitatively by a colorimetric procedure in the presence of varying amounts of stannous ion. The stannic ion is first determined for the solution in situ having a pH of approximately 1. 0. A similar solution sample is made highly acidic, approximately 0. 1 pH, by addition of an acid slightly in excess of one molar. The measurement of the stannic ion in the solution in situ determines the stannic ion monomer present in the solution. The measurement using a large excess of acid determines the total stannic ion in the solution. From these figures, the per cent monomer in the solution may be readily calculated.

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Analytical Method of Distinguishing Between the Species of Stannic Ion in the Presence of Stannous Ion

There is a pH dependent equilibrium between the species of stannic ion as follows: The presence of each species in a given solution of stannic ion is analyzed directly and quantitatively by a colorimetric procedure in the presence of varying amounts of stannous ion. The stannic ion is first determined for the solution in situ having a pH of approximately 1. 0. A similar solution sample is made highly acidic, approximately 0. 1 pH, by addition of an acid slightly in excess of one molar. The measurement of the stannic ion in the solution in situ determines the stannic ion monomer present in the solution. The measurement using a large excess of acid determines the total stannic ion in the solution. From these figures, the per cent monomer in the solution may be readily calculated.

The following is an example of the procedure to be used to determine the stannic ion concentration in both the in situ and highly acid samples. There is prepared a 4% by weight solution of 8-hydroxyquinoline in hydrochloric acid with the solution having a pH of between 0. 7 to 0. 9. Twenty-five ml each of chloroform and the prepared 4% solution of 8-hydroxyquinoline are added to a separatory funnel. An appropriate aliquot of solution to be tested for stannic ion is also added to the separatory funnel. The mixture in the separatory funnel is shaken for approximately 2 minutes with occasion...