In a lab 84.9 mL of a 0.10 M aqueous solution of Ba(OH)2 was used to titrate a 1.3 M aqueous solution of HCl. How much HCl was present? (show work)
(40 points please help)

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.