二、归纳和说明: 1、Ag(一价)、Cu(二价)、Al(三价)三类金属与浓、稀HNO_3反应系数整体趣记。 (1)金属的系数:浓酸时都为1,稀酸时则为3; (2)前提(1)下,三类金属对应的浓HNO_3系数(2、4、6)和稀HNO_3系数(4、8、12)都呈等差递增数列,且公差分别为2和4; (3)前提(1)下,每一类金属对应HNO_3系数都有n稀=2n浓,但与等质量金属完全反应时,耗酸量都是浓酸多于稀酸; Second, induction and description: 1, Ag (a price), Cu (bivalent), Al (trivalent) three metals and concentrated, dilute HNO_3 reaction coefficient as a whole interesting. (1) The coefficient of metal is 1 for concentrated acid and 3 for dilute acid; (2) Under the premise (1), the corresponding HNO_3 coefficients (2, 4, 6) and lean HNO_3 coefficients of three metals ( 4,8,12) are all in equal increments and the tolerances are 2 and 4 respectively; (3) Under the premise (1), the HNO_3 coefficients for each type of metal have n = 2n, but with equal mass of metal When fully reacted, acid consumption is more concentrated than dilute acid;