Question

The formula of calgon, used for water softening, is:

• A. $Na _{2}\left[ Na _{4}\left( PO _{3}\right)_{6}\right]$
• B. $Na _{4}\left[ Na _{2}\left( PO _{3}\right)_{6}\right]$
• C. $Na _{2}\left[ Na _{4}\left( PO _{4}\right)_{5}\right]$
• D. $Na _{4}\left[ Na _{4}\left( PO _{4}\right)_{6}\right]$

Answer 1

Answer: (A)

For water softening calgon is used. Its formuls is $Na _{2}\left[ Na _{4}\left( PO _{3}\right)_{6}\right]$. It removes dissolved minerals of water which reduces the cleaning efficiency of water.