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It depends on the reagent used, but most of the time the more acidic the substance is, the brighter yellow it shows up on the scale when a sample is tested for pH, while strong bases are usually deep blue. Greens are usually in the 7.0 range, or neutral. Your pH testing substance should come with a color scale, and you just match up the color of your testing strip after dipping it or touching it to the test substance with the color on the scale.

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13y ago

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