Ngày tải lên :
21/12/2014, 11:30
... 27 Cng theo ụn cp Tõy g Nam nhit Nam B B (oC) % so vi ton quc 48 131 51 ,78 (30-40 oC) Núng va 38 22 77 30,43 (41-60 oC) Rt núng 24 41 16,21 (61-100 oC) Quỏ núng 0 0 5,58 (>100 oC) Cng theo 78 ... (mgN/L) V dd chun lm vic (mL) 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 5,0 6,0 7, 0 8,0 1,25 2,5 3 ,75 5,0 6,25 7, 5 8 ,75 10 12,5 15 17, 5 20 Thờm nc ct cho n vch nh mc 25 mL, cỏc cc 100 mL Dựng pipet hỳt ... 30 40 50 60 70 80 90 100 120 2,5 5,0 7, 5 10,0 12,5 15,0 17, 5 20,0 22,5 25 30 B sung nc ct ti 250 mL Thờm 21 mL HCl c, 8,5 mL dung dch KI, 1 ,7 mL dung dch SnCl2, i 30 phỳt Chun b 7, 5 g km ht,...