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aluminum hydrochloric acid reaction

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From Yahoo Answers

Question:When aluminum foil is placed in hydrochloric acid, nothing happens for about 30 seconds or so. This is followed by vigorous bubbling and the eventual disappearance of the foil. Explain these observations.

Answers:The reaction that occurs is 2 Al + 6 HCL ---> 2 AlCl3 + 3 H2 So the bubbling gas is hydrogen. The reason there is a slight delay is that aluminum forms a very thin oxide layer which must be dissolved first.

Question:What is the mass of hydrogen gas released from 2.70g of aluminum metal and hydrochloric acid? (Balance the reaction first) __Al(s) + __HCl(aq) -->__AlCl3(aq) + __H2(g)

Answers:2 Al + 6 HCl = 2 AlCl3 + 3 H2 moles Al = 2.70 g/ 27 g/mol= 0.10 moles H2 = 0.10 x 3 / 2 =0.15 mass H2 = 0.15 mol x 2 g/mol= 0.30 g

Question:so i did a lab on this and i put metals such as lead, aluminum and manganese into both hydrochloric acid and sulfuric acid, but only magnesium and manganese had some reactions with both acids, im pretty sure my results are not right ....so how do i know whether a reaction took place or not? and if a reaction took place, is hydrogen gas produced in all cases?

Answers:Do you mean manganese or magnesium or both? Manganese is not a common school lab reagent. Magnesium expect vigorous reaction with dilute HCl and H2SO4 Manganese not a very fast reaction at all. Lead hardly any reaction seen Aluminium no (or slight) reaction due to impervious oxide coating (btw Aluminium is spelled that way in UK and other English speaking countries) In all cases hydrogen gas is released in case of magnesium heat evolved is appreciable.

Question:Which of the following compounds results from treating aluminum oxide with excess aqueous sulfuric acid and what are the steps to getting it? (b) [Al(H2O)6]2(SO4)3 (c) H[Al(OH)4] (d) Al2S3 (e) Al(OH)3

Answers:Al2O3 + 3H2SO4 -------- Al2(SO4)3 + 3 H2O The compound forms a hexahydrate in aqueous systems ( aqueous H2SO4 ). b is the answer this is a typical neutralization of a basic oxide withan acid forming a salt plus water.

From Youtube

Chemical Reactions: Hydrochloric Acid + Aluminium Foil Bomb :This was part 2 in a series of teaching resource videos designed to demonstrate what chemical reactions are. In reality, this was just a fun excuse to blow stuff up in the name of science. It shows that when you react an acid with a metal (in this case, HCl and aluminum foil) you get hydrogen gas plus a salt, in this case, aluminum chloride.

Metals vs Hydrochloric acid :WARNING: Wear gloves when using hydrochloric acid. This is very dangerous, strong and corrosive acid. In this video, I will show you the reactions of hydrochloric acid and metals. A lot of hydrogen gas is produced so be careful. YOU WILL NEED: - hydrochloric acid (I m using 33% concentraton) - a 100ml container - a gloves - zinc metal - copper metal - aluminum foil - an iron nail Let s get started. First is the zinc metal. You can see, very reactive in hydrochloric acid. Next, the copper. It doesn t seems it s reacting, but when you have copper oxide, hydrochloric acid dissolves the copper oxides and solution turns blue. But nothing else happens. Now the aluminum foil. Very reactive, but firstly, as you can see, it s very slow due the protective layer on the alimunum foil. When the layer is dissolved, aluminum starts reacting. The last is an iron nail. At the beggining you can see some bubbles of H2, but that is all. Thank you for whatching ! The next video is coming soon ! Please subscribe, rate and comment. FOLLOW AND TWEET ME ON TWITTER: twitter.com ASK ME A QUESTIONS HERE: ChemExperimentalist@gmail.com