what is an indicator ?
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ᴄʜᴇᴍɪᴄᴀʟ ɪɴᴅɪᴄᴀᴛᴏʀ, ᴀɴʏ sᴜʙsᴛᴀɴᴄᴇ ᴛʜᴀᴛ ɢɪᴠᴇs ᴀ ᴠɪsɪʙʟᴇ sɪɢɴ, ᴜsᴜᴀʟʟʏ ʙʏ ᴀ ᴄᴏʟᴏᴜʀ ᴄʜᴀɴɢᴇ, ᴏғ ᴛʜᴇ ᴘʀᴇsᴇɴᴄᴇ ᴏʀ ᴀʙsᴇɴᴄᴇ ᴏғ ᴀ ᴛʜʀᴇsʜᴏʟᴅ ᴄᴏɴᴄᴇɴᴛʀᴀᴛɪᴏɴ ᴏғ ᴀ ᴄʜᴇᴍɪᴄᴀʟ sᴘᴇᴄɪᴇs, sᴜᴄʜ ᴀs ᴀɴ ᴀᴄɪᴅ ᴏʀ ᴀɴ ᴀʟᴋᴀʟɪ ɪɴ ᴀ sᴏʟᴜᴛɪᴏɴ. ᴀɴ ᴇxᴀᴍᴘʟᴇ ɪs ᴛʜᴇ sᴜʙsᴛᴀɴᴄᴇ ᴄᴀʟʟᴇᴅ ᴍᴇᴛʜʏʟ ʏᴇʟʟᴏᴡ, ᴡʜɪᴄʜ ɪᴍᴘᴀʀᴛs ᴀ ʏᴇʟʟᴏᴡ ᴄᴏʟᴏᴜʀ ᴛᴏ ᴀɴ ᴀʟᴋᴀʟɪɴᴇ sᴏʟᴜᴛɪᴏɴ.
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Answer:
The substances which show different behaviour in acidic and basic medium and thus help in determining the chemical nature of the substance is called Indicator.
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