(1)1:6;KBr(2)5Br- + BrO3- + 6H+ = 3Br2 + 3H2O(3)知空不正确;这早凳里体现的是I2单质的还原性。c点:n(KBrO3)=1 + 1/5 = 1.2 mol;4 - 1.2 = 2.8mol;I2被氧化得到IO3-:陆猛旅n=2.8mol;n(含碘)=2.8+(3-1.4)=4.4mol(4)7.2a mol