****kkkkkkkkkkkkkkkkk for the emprical formula i did everything right but did not times the ratios by 2 so got feo2 or something how many marks for working? Also flopped the acid question put chlrorine lols aswell as think i put -2e- for the half equation otherwise did alright, also for the 2 mark error question would they allow a crucible was used which is used to purify substantces? i did however put 2 other errors like weighing etc but just wondering about crucible one. Thanks!