According to the color changes produced by the mixture indicator when combined with standard buffer solutions ranging from pH 4.0 to 8.0, various colored inorganic reagent solutions were mixed in different proportions to create a simulated pH reference stock solution. This solution was used as a visual guide to estimate the pH of unknown samples. By comparing the color of the tested solution with the pre-prepared reference, the pH value could be roughly determined. This method offers a simple and cost-effective way to assess acidity or alkalinity without the need for complex instruments, making it particularly useful in field studies or basic laboratory settings. The accuracy depends on the consistency of the indicator and the clarity of the color comparison, so careful preparation and controlled conditions are essential for reliable results.
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