Question

define indicator Plz​

Answer 1

Answer:

a substance (as a dye) used to show visually (as by a change in color) the condition of a solution with respect to the presence of a particular material (as a free acid or alkali) litmus and phenolphthalein are acid-base indicators.

Answer 2

$\huge{\underline{\underline{\underline{\sf{\pink{Anѕwєя}}}}}}$

• ᴀ sᴜʙsᴛᴀɴᴄᴇ (ᴀs ᴀ ᴅʏᴇ) ᴜsᴇᴅ ᴛᴏ sʜᴏᴡ ᴠɪsᴜᴀʟʟʏ (ᴀs ʙʏ ᴀ ᴄʜᴀɴɢᴇ ɪɴ ᴄᴏʟᴏʀ) ᴛʜᴇ ᴄᴏɴᴅɪᴛɪᴏɴ ᴏғ ᴀ sᴏʟᴜᴛɪᴏɴ ᴡɪᴛʜ ʀᴇsᴘᴇᴄᴛ ᴛᴏ ᴛʜᴇ ᴘʀᴇsᴇɴᴄᴇ ᴏғ ᴀ ᴘᴀʀᴛɪᴄᴜʟᴀʀ ᴍᴀᴛᴇʀɪᴀʟ (ᴀs ᴀ ғʀᴇᴇ ᴀᴄɪᴅ ᴏʀ ᴀʟᴋᴀʟɪ) ʟɪᴛᴍᴜs ᴀɴᴅ ᴘʜᴇɴᴏʟᴘʜᴛʜᴀʟᴇɪɴ ᴀʀᴇ ᴀᴄɪᴅ-ʙᴀsᴇ ɪɴᴅɪᴄᴀᴛᴏʀs.