Question

give a scientific reason of the copper and brass vessels are cleaned with lemon

Answer 1

ᴄᴏᴩᴩᴇʀ ᴏxɪᴅᴇ ɪꜱ ʙᴀꜱɪᴄ ɪɴ ɴᴀᴛᴜʀᴇ.ʟᴇᴍᴏɴ ᴏʀ ᴛᴀᴍᴀʀɪɴᴅ ɪꜱ ᴀᴄɪᴅɪᴄ.ʜᴇɴᴄᴇ, ᴡʜᴇɴ ᴡᴇ ʀᴜʙ ᴛᴀʀɴɪꜱʜᴇᴅ ᴄᴏᴩᴩᴇʀ ᴠᴇꜱꜱᴇʟ ᴡɪᴛʜ ʟᴇᴍᴏɴ ᴊᴜɪᴄᴇ ᴏʀ ᴛᴀᴍᴀʀɪɴᴅ, ᴛʜᴇ ʙᴀꜱɪᴄ ᴄᴏᴩᴩᴇʀ ᴏxɪᴅᴇʀ ʀᴇᴀᴄᴛꜱ ᴡɪᴛʜ ᴀᴄɪᴅ(ᴄɪᴛʀɪᴄ ᴀᴄɪᴅ) ᴩʀᴇꜱᴇɴᴛ ɪɴ ᴛʜᴇ ʟᴇᴍᴏɴ ᴏʀ ᴛᴀᴍᴀʀɪɴᴅ ᴛᴏ ꜰᴏʀᴍ ᴀ ꜱᴀʟᴛ ᴡʜɪᴄʜ ɪꜱ ᴡᴀꜱʜᴇᴅ ᴀᴡᴀy ᴡɪᴛʜ ᴡᴀᴛᴇʀ.ʜᴇɴᴄᴇ,ᴛʜᴇ ᴠᴇꜱꜱᴇʟ ɢᴇᴛꜱ ᴄʟᴇᴀɴᴇᴅ

Answer 2

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Ans: The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. That is why, tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.