\( 100 \, \text{ml} \) of \( 0.0018\% \) (w/v) solution of \( \text{Cl}^- \) ion was the minimum concentration of \( \text{Cl}^- \) required to precipitate a negative sol in one \( \text{h} \). The coagulating value of \( \text{Cl}^- \) ion is ___________. (Nearest integer)
