Question

3. a. Why should the Cu(OH)2 precipitate that is formed during reaction (ii) be heated slowly during reaction (ii)? b. Why does reaction (i) have to be carried out in the fume hood? 4. Reaction (iii) is considered to be c) decomposition d) acid-base e) precipitation b) single displacement a) combination

Answer 1

0. Balancing the reaction " cuiso + HNO₃ lage - CUNO3l2 lag + Nos t thou Balanced equation Cuss, + THNO3 hp - Cu(NO32 lag? + 2 Norg .. + 2 1,0 (2) . rrin culoog & Naoran . Cu(OH)2 is; & NaNO3 lag Balancing Cu(NO2 + 2NaOH - Cu(OH)2 + 2N0 NO3 сні, Сон), is — Cors + H 2 (1) already balamed. e weight of cu 0.65 g. wolon whому я л - 63.50 чо? moles of cut 0.659 30.01 mor . 63.5 gmorn concentration of moon 56m j volivie - 4.0mL = 4.0 x103L. biuro can ; .naciva = 6 x 4.0x103 mot = 12x103 mol - 0.012 mot

I mal a must react with u mol HNO3. and no 0.01 mol or cu must react with 0.04 mol of ANO , but HNO is only 0.012 mal so HNO is limiting reagent ②. a). Cu(OH)2 a light blue colour precipitate is heated slowly to produce cuo copper onide which is more stable than the preceding metastable compound.. and dehydration occurs resulting in release of tho molecule. is b) Reaction is harmful heated in releases or tonic, fume hood NO₂ gas which Therefore it is () decomposition, breaks down to a single produce reactant two products

I mal a must react with u mol HNO3. and no 0.01 mol or cu must react with 0.04 mol of ANO , but HNO is only 0.012 mal so HNO is limiting reagent ②. a). Cu(OH)2 a light blue colour precipitate is heated slowly to produce cuo copper onide which is more stable than the preceding metastable compound.. and dehydration occurs resulting in release of tho molecule. is b) Reaction is harmful heated in releases or tonic, fume hood NO₂ gas which Therefore it is () decomposition, breaks down to a single produce reactant two products