pomogite reshit' zada4i
1. rass4itat' pH byfernogo rastvora, poly4ennogo pytem smesheniya 100mL 1,0M HC2H3O2 ( Ka=1,75*10^(-5) ) s 50 mL 1,0M NaOH
2. rass4itat' izmenenie pH, kotoroe proishodit pri dobavlenii 10mL 1,0M NaOH k 500mL byfernogo rastvora, sodergashego 0,10M HC2H3O2 i 0.10M NaC2H3O2. Ka=1,75*10^(-5) dlia HC2H3O2
3.Skol'ko gramm trisa (HOCH2)3CNH2 (moliarnaya massa 121,14 g/mol) nado dobavit' k 200mL 1,0M HCl, 4tob poly4it' 3,0 litra byfernogo rastvora s pH=7.40?