Question

aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water. suppose 36. g of hydrochloric acid is mixed with 21.0 g of sodium hydroxide . Calculate the minimum of hydrochloric acid that could be left over by the chemical reaction round your answer to 2 sig figs

Answer 1

HCl + NaOH --------------> NaCl + H2O

no of moles of HCl   = W/G.M.Wt

                                 = 36/36.5   = 0.986 moles

no of moles of NaOH   = W/G.M.Wt

                                      = 21/40   = 0.525 moles

from balanced equation

1 mole of HCL react with 1 mole of NaOH

HCl is excess reagent

left no of moles of HCl   = 0.986-0.525   = 0.461 moles

mass of HCl is left   = 0.461 *36.5    = 17g of HCl