\(CTHH:R_2O_3\Rightarrow R\left(III\right)\)
\(R,Cl\rightarrow RCl_3;PTK:M_R+106,5\)
\(R,OH\rightarrow R\left(OH\right)_3;PTK:M_R+51\)
\(R,CO_3\rightarrow R_2\left(CO_3\right)_3;PTK:2M_R+180\)
\(R,SO_4\rightarrow R_2\left(SO_4\right)_3;PTK:2M_R+288\)
\(R,PO_4\rightarrow RPO_4;PTK:M_R+95\)