Nqir

.ri tr: rii'trhirlh liai Lhi ttrilri0ttl slttt: -'i'hi lghient i : ch.; ttt Lti.ttn N{g r io cdc,thtrr'linh ch[ra 29"4 gam H2SOa. - l-tri rignigpr 2 : .ir,; ,,i garl itl vr'ro c6c tiriry tinh chitii 2(),4 gatn HzSO+ nhu o thi nghiOm l. Xirc clinh nr ilt a, I(ittt loiri trottg. irrii lili nglri0rl tilrl h0i lrcirrg axit. b. Cl6 m6t kin-r lorii rari irit vii liir-rllt;iii I'h0ng tan l-rOt finh tlii Litrir l,iri l{2 ti nrOi ti'LLirtlg hrrp trerl.