The fizz produced when an Alka-Seltzer® tablet is dissolved in water is due to the reaction between sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7):
In an experiment 1.25 g of sodium bicarbonate and 1.25 g of citric acid react. How many grams of the excess reactant remain after the limiting reactant is completely consumed?