10. Na2[SiF6]
NaOH
10
OH
CH
2
O OH
O
N
H2
C
CH
2
O
C
C
O
OH
OH
× 2H2O
Ce(NO3)3
OH
CH2
O OH
O
N
H2
C
CH
2
O
C
C
O
O
O
Ce
OH2
OH2
OH
CH
2
O OH
O
N
H2
C
CH
2
O
C
C
O
O
O
Ce
OH2
OH2
F
red colour
blue colour
12. 12
CH2
CH2
N
N
CH2
CH2
COOH
COOH
CH2
CH2
COONa
COONa
+
H2O OH2
NaO3S
O2N
O Zn O
N N
CH2
CH2
N
N
CH2
CH2
CH2
CH2
COO-COO-Zn
COO
COO
2Na+ +
NaO3S
O2N
OH OH
N N
13. 13
NaO3S
O2N
OH OH
N N
+ Mg2+
NaO3S
O2N
H2O OH2
O Mg O
N N
H2O OH2
NaO3S
O2N
O Mg O
N N
+
CH2
CH2
N
N
CH2
CH2
CH2
CH2COONa
CH2COOH
CH2COOH
CH2 CH2COONa
2Na+
CH2
CH2
N
N
CH2
CH2
CH2
CH2
COO-COO-Mg
COO
COO
+
NaO3S
O2N
OH OH
N N