Abstract
The purpose of this research is to determining the concentration of the coloured solution NiSO4 and to know the accuracy of smartphone application usage. Determining the concentration of a coloured solution using a smartphone can be an alternative to overcome the limitations of spectrophotometric or colorimetric instruments. An approach using the smartphone is based on hue colon is read by a smartphone application, then the data generated from the application is RGB value and will be processed to determine the concentration. Determining the concentration of the coloured solution is assisted by three standards solution and the concentration are known to make the standard curves. The methodology of this research is research and development. The results in this research have a fairly good accuracy percentage, for both unknown concentrations of NiSO4 solution the percentage of accuracy is 100% and 95% with a percent error is 0% and 5%. This indicates the application on the smartphone is suitable for use in determining the concentration of the coloured solution.
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