Baking soda has salt and acid.  Salt and acid  causes rust.  But why is baking soda still considered as a rust remover?  What is in it that makes it suitable?baking soda has salt, acid? a...

Baking soda has salt and acid.  Salt and acid  causes rust.  But why is baking soda still considered as a rust remover?  What is in it that makes it suitable?

baking soda has salt, acid? a rust remover?

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bandmanjoe | Middle School Teacher | (Level 2) Senior Educator

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Baking soda has the chemical formula NaHCO3.  It has a tendency to maintain a pH of about 8.1 on the pH scale, even when mixed with substances that are classified as acids, with lower numbers on the pH scale.  Baking soda can be used to remove rust by combining it with water to make a thick paste.  Application to the rust spot follows next, and allow the paste to set about 30 minutes.  The carbonate ion in the paste combines with the iron and removes the rust as a result.  Depending on the severity of the rust stain, several repeated applications may be necessary.  Baking soda has many applications, in the food industry and other industrial applications.  It absorbs food odors by chemical interaction; it makes a great deodorizer when placed in refrigerators.  The carbon dioxide gas it produces makes it an effective fire extinguisher material in the prevention of fires.

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