, - , :
1) ;
2) ;
3) ;
4) , - .
: Na2B4O7×10H2O (), Na2C2O4, Na2O3×10H2O, H2C2O4×2H2O .
(, HCl, H2SO4, NaOH .), .
HCl ( 1) 0,05 0,2 /. HCl - , HCl , :
1) Na2B4O7×10H2O Na2O3×10H2O;
2) HCl:
Na2B4O7 + 2HCl + 5H2O = 4H3BO3 + 2NaCl,
Na2O3 + 2HCl = 2NaCl + H2O + CO2;
3) (3) HCl.
NaOH . () , 2 23 Na2CO3. (~ 50%) . 23 Na2CO3, . , 224×2H2O :
2NaOH + 224 = Na2C2O4 + 22,
2 + 224 = 224 + 22.