what precautions should be taken while finding the pH of lemon juice
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Precautions
Use only the standard colour pH chart supplied with the pH paper for assessing the pH value.
Keep the pH strips away from chemical fumes.
Either use fresh fine dropper or glass rod for each different sample, or wash the dropper or glass rod well with water every time.
To correctly view the colour produced on the pH paper, keep the pH paper on a white tile while performing the experiment.
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