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    why is there a 2 on the 2nd and 3rd last lines?


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    (Original post by bally)
    why is there a 2 on the 2nd and 3rd last lines?



    because 1 mole of Na2CO3 requires 2 moles of HCl for reaction
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    (Original post by charco)
    because 1 mole of Na2CO3 requires 2 moles of HCl for reaction
    to be more explicit,

    there are 2 Na atoms in Na2Co3 - so 2 mols of NaCl formed from each mol of it.
    but with NaHCO3, only 1 mol of NaCl is produced.

    Thus, Na2CO3 contributes twice as much as NaHCO3---> *2 in equation
 
 
 
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