$55ml$ of $0\mathrm{.}3M$ sodium nitrate is added $45ml$ of $0\mathrm{.}5M$ calcium nitrate whi is added to $85ml$ of $0\mathrm{.}08M$ aluminium nitrate which is added to $49ml$ of water. Determine the concentration of a$)$ the sodium ion and b$)$ the nitrat ion.