A compound used to remove permanent hardness of water reacts with HCl to
produce NaCl, CO2 and H2O? Identify
the compound.

Well by looking at the products,it must be sodium bicarbonate (NaHCO3)

Step-by-step explanation:

but then sodium bicarbonate does not remove permanent hardness of water,that compound is washing soda(Na2CO3) which should not be confused with NaHCO3. So as it would appear,the premise of the question is wrong but there is a compound that reacts with HCl to give those products

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$15.40 per mile

step-by-step explanation:

you have to round up to 4 because 6 is over 5 so you have to round the 3 up to 4