#sf((a))#
Start with the equation:
#sf(Ba(OH)_(2)+2HClrarrBaCl_2+2H_2O)#
#sf(c=n/v)#
#:.##sf(n=cxxv)#
#:.##sf(n_(Ba(OH)_2)=0.1529xx43.09=6.5884color(white)(x)"mmol")#
From the equation we can see that the no. moles of #sf(HCl)# must be twice this.
#:.##sf(n_(HCl)=6.5884xx2=13.177color(white)(x)"mmol")#
#:.##sf([HCl]=c/v=(13.177xxcancel(10^(-3)))/(26.06/(cancel(1000)))=0.5056color(white)(x)"mol/l")#
#sf((b))#
#sf(HCl+RbOHrarrRbCl+H_2O)#
#sf(n_(HCl)=cxxv=0.5056xx27.05=13.676color(white)(x)"mmol")#
From the equation we can see that the no. moles of #sf(RbOH)# must be the same .
#:.##sf(n_(RbOH)=13.676color(white)(x)"mmol")#
#:.##sf([RbOH]=c/v=(13.676xxcancel(10^(-3)))/(15.00/(cancel(1000)))=0.9118color(white)(x)"mol/l")#