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What color does litmus paper turn in the presence of an acid?

Blue

Green

Red

When litmus paper comes into contact with an acid, it undergoes a color change to red. This is a characteristic behavior of litmus as a pH indicator; it is derived from lichens and is widely used to determine the acidity or alkalinity of a solution. Litmus paper is initially blue, indicating a basic or neutral pH. When it encounters an acidic solution, typically one with a pH lower than 7, the chemical structure of the dyes in the litmus paper changes, resulting in the paper turning red.

This color change is a simple and effective way to test for acidity in various substances, as acids exhibit a range of pH levels below 7. In contrast, the other color options do not represent a reaction with acids; blue is what litmus paper starts as when it's in a basic solution, while green and yellow do not correspond to any specific change related to litmus paper and acid interaction.

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