What volume of 3.00M HCl in liters is needed to react completely (with nothing left over) with 0.750L of 0.400M Na2CO3?

1 answer

Na2CO3 + 2HCl ==> 2NaCl + H2O + CO2

mols Na2CO3 = M x L = ?
Using the coefficients in the balanced equation, convert mols Na2CO3 to mols HCl.
Then M HCl = mols HCl/L HCl. YOu know M HCl and mols HCl, solve for L HCl.