5 2 3 ). 3 1 2 ). 7 1 3 ).
1 10
1 3
ph Cr( OH) 4
ph 10 NaCN NaOCl NaOCN NaCl (1) 2NaOCN 3NaOCl H 2 O ph=8 N 2 3NaCl 2NaHCO 3 (2) ph 10 HCN NaOCl CNCl NaOH