Question

what do you mean by precipitation

Answer 1

Formation of a solid product after the reaction is called precipitation
EX. AgNO3 + NaCl -------> AgCl(PERCIPITATE) + NaNO3

Answer 2

ᴘʀᴇᴄɪᴘɪᴛᴀᴛɪᴏɴ ɪs ʀᴀɪɴ, sɴᴏᴡ, sʟᴇᴇᴛ, ᴏʀ ʜᴀɪʟ — ᴀɴʏ ᴋɪɴᴅ ᴏғ ᴡᴇᴀᴛʜᴇʀ ᴄᴏɴᴅɪᴛɪᴏɴ ᴡʜᴇʀᴇ sᴏᴍᴇᴛʜɪɴɢ's ғᴀʟʟɪɴɢ ғʀᴏᴍ ᴛʜᴇ sᴋʏ. ᴘʀᴇᴄɪᴘɪᴛᴀᴛɪᴏɴ ʜᴀs ᴛᴏ ᴅᴏ ᴡɪᴛʜ ᴛʜɪɴɢs ғᴀʟʟɪɴɢ ᴅᴏᴡɴ, ᴀɴᴅ ɴᴏᴛ ᴊᴜsᴛ ғʀᴏᴍ ᴛʜᴇ sᴋʏ. ɪᴛ's ᴀʟsᴏ ᴡʜᴀᴛ ʜᴀᴘᴘᴇɴs ɪɴ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴs ᴡʜᴇɴ ᴀ sᴏʟɪᴅ sᴇᴛᴛʟᴇs ᴛᴏ ᴛʜᴇ ʙᴏᴛᴛᴏᴍ ᴏғ ᴀ sᴏʟᴜᴛɪᴏɴ.