Question

what are indicators ? with the help of example explain the colour change in acidic and basic medium of acid base indicator​

Answer 1

「ᴇxᴀᴍᴘʟᴇs ᴏғ ᴀᴄɪᴅ-ʙᴀsᴇ ɪɴᴅɪᴄᴀᴛᴏʀs ɪɴᴄʟᴜᴅᴇ ʟɪᴛᴍᴜs ᴘᴀᴘᴇʀ, ᴘʜᴇɴᴏʟᴘʜᴛʜᴀʟᴇɪɴ, ᴀɴᴅ ʀᴇᴅ ᴄᴀʙʙᴀɢᴇ ᴊᴜɪᴄᴇ. ᴀɴ ᴀᴄɪᴅ-ʙᴀsᴇ ɪɴᴅɪᴄᴀᴛᴏʀ ɪs ᴀ ᴡᴇᴀᴋ ᴀᴄɪᴅ ᴏʀ ᴡᴇᴀᴋ ʙᴀsᴇ ᴛʜᴀᴛ ᴅɪssᴏᴄɪᴀᴛᴇs ɪɴ ᴡᴀᴛᴇʀ ᴛᴏ ʏɪᴇʟᴅ ᴛʜᴇ ᴡᴇᴀᴋ ᴀᴄɪᴅ ᴀɴᴅ ɪᴛs ᴄᴏɴᴊᴜɢᴀᴛᴇ ʙᴀsᴇ ᴏʀ ᴇʟsᴇ ᴛʜᴇ ᴡᴇᴀᴋ ʙᴀsᴇ ᴀɴᴅ ɪᴛs ᴄᴏɴᴊᴜɢᴀᴛᴇ ᴀᴄɪᴅ. ᴛʜᴇ sᴘᴇᴄɪᴇs ᴀɴᴅ ɪᴛs ᴄᴏɴᴊᴜɢᴀᴛᴇ ʜᴀᴠᴇ ᴅɪғғᴇʀᴇɴᴛ ᴄᴏʟᴏʀs.」♡

Answer 2

Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice. An acid-base indicator is a weak acid or weak base that dissociates in water to yield the weak acid and its conjugate base or else the weak base and its conjugate acid. The species and its conjugate have different colors.