Question

permanent hardness of water is dissolve​

Answer 1

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• Permanent Hardness of Water: When the soluble salts of magnesium and calcium are present in the form of chlorides and sulfides in water, we call it permanent hardness because thishardness cannot be removed by boiling. We can remove this hardnessby treating the water with washing soda.

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Answer 2

Explanation:

• ᴡʜᴇɴ ᴛʜᴇ sᴏʟᴜʙʟᴇ sᴀʟᴛs ᴏғ ᴍᴀɢɴᴇsɪᴜᴍ ᴀɴᴅ ᴄᴀʟᴄɪᴜᴍ ᴀʀᴇ ᴘʀᴇsᴇɴᴛ ɪɴ ᴛʜᴇ ғᴏʀᴍ ᴏғ ᴄʜʟᴏʀɪɴᴇs ᴀɴᴅ sᴜʟғɪᴅᴇs ɪɴ ᴡᴀᴛᴇʀ,ᴡᴇ ᴄᴀʟʟ ɪᴛ ᴘᴇʀᴍᴀɴᴇɴᴛ ʜᴀʀᴅɴᴇss ʙᴇᴄᴀᴜsᴇ ᴛʜɪs ʜᴀʀɴᴇss ᴄᴀɴɴᴏᴛ ʙᴇ ʀᴇᴍᴏᴠᴇᴅ ʙʏ ʙᴏɪʟɪɴɢ.