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How could an indicator be used to find out something is acidic or alkaline if the label was missing?

How could an indicator be used to find out something is acidic or alkaline if the label was missing?
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How could an indicator be used to find out something is acidic or alkaline if the label was missing?

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User Recurse
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just measure based on scale pH 0 to pH 14 and observed the colour changes where under 7 is acidic and it turns indicator into red, while 7 above is alkaline which produce dark purple
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User Vladislav Ladicky
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