Common coagulants (salts) used in conventional water treatment include the following alum (aluminum sulfate), sodium aluminate, ferric sulfate, ferrous sulfate, ferric chloride, and polymers. Question 1 options: True False

True

Explanation:

This is the true statement .

Because There are two types of metal coagulants used : aluminium and iron.

The aluminum coagulants include aluminum sulfate, aluminum chloride and sodium aluminate.

The iron coagulants include ferric sulfate, ferrous sulfate, ferric chloride and ferric chloride sulfate.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

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