Three identical test tubes contain water, sodium hydroxide solution and sulfuric acid solution. How to distinguish

Three identical test tubes contain water, sodium hydroxide solution and sulfuric acid solution. How to distinguish the contents of tubes using one indicator?

Add a few drops of an indicator solution, such as litmus, to each tube. In a test tube with a solution of sulfuric acid, the color of the litmus will turn red, in a test tube with a solution of sodium hydroxide – blue, in a test tube with water the color will not change.

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