In a nickel titration of cyanide ions using murexide as an indicator, an accurate equivalence point was determined by a nonlinear least-squares curve-fitting for a titration curve. This method was developed to establish a standard solution for cyanide ions. In a curve-fitting procedure, a theoretical titration curve was calculated, assuming that nickel ion formed only 1:4 complex with cyanide ions and formed only 1:1 complex with murexide. Results of the curve-fitting were reasonable at any pH and any indicator concentration studied.
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| Titration curves for nickel titration of cyanide ions |
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| Relational Information |
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AIST Today Vol. 2, No. 7 (2002) 17
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No.6 Autumn 2002
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