Explain the formation of scum when hard water treated with soap
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When soap is used for washing clothes in hard water,a large amount of soap is washed inteacting with the calcium and magnesium ions of hard water to form an insoluble precipitate called SCUM ,before it can be used for the real purpose of washing.So,a large amount of soap is needed for wasing clothes when the water is hard.
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ʜᴀʀᴅ ᴡᴀᴛᴇʀ ᴄᴏɴᴛᴀɪɴs ᴄᴀʟᴄɪᴜᴍ ᴀɴᴅ ᴍᴀɢɴᴇsɪᴜᴍ sᴀʟᴛs. ᴡʜᴇɴ sᴏᴀᴘ ɪs ᴀᴅᴅᴇᴅ ᴡɪᴛʜ ʜᴀʀᴅ ᴡᴀᴛᴇʀ, ɪᴛ ʀᴇᴀᴄᴛs ᴡɪᴛʜ ᴛʜᴇ ᴄᴀʟᴄɪᴜᴍ ᴀɴᴅ ᴍᴀɢɴᴇsɪᴜᴍ ɪᴏɴs ᴏғ ʜᴀʀᴅ ᴡᴀᴛᴇʀ ᴛᴏ ғᴏʀᴍ ᴀɴ ɪɴsᴏʟᴜʙʟᴇ sᴜʙsᴛᴀɴᴄᴇ ᴄᴀʟʟᴇᴅ sᴄᴜᴍ.
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