Pop sound test for hydrogen when Zinc Metal react with acid ANIMATED VIDEOS Jatin Academy (2020)

Pop sound test for hydrogen-Reaction of Zinc Metal with Acid- ANIMATED VIDEOS -Jatin Academy

Reactions of acids with metals

Acids take part in reactions in which salts are produced. In these reactions, the hydrogen ions in the acids are replaced by metal ions.

Reactions of acids with metals

When acids react with metals, the products are a salt and hydrogen. In general:
Acid + metal → salt + hydrogen
For example:
Hydrochloric acid + magnesium → magnesium chloride + hydrogen
2HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)
Zinc and iron also react with hydrochloric acid.
Magnesium, zinc and iron also react with sulfuric acid. The products are a salt (in this case a sulfate) and hydrogen. For example:
sulfuric acid + iron → iron(II) sulfate + hydrogen
H2SO4(aq) + Fe(s) → FeSO4(aq) + H2(g)
Question
Name the two products of the reaction of zinc with hydrochloric acid.
Name the products of the reaction between zinc and sulfuric acid, and write an equation for the reaction.
Testing for hydrogen gas

Hydrogen gas is highly flammable. You can safely test for small quantities of hydrogen gas (eg collected in a test tube) by holding a burning splint near to the top of the test tube. The positive result is a squeaky pop sound as the hydrogen reacts with oxygen in the air in a small explosion.

Explaining the reactions of acids with metals - Higher

The reactions of acids with metals are redox reactions. For example, the ionic equation for the reaction of magnesium with hydrochloric acid is:
2H+(aq) + Mg(s) → Mg2+(aq) + H2(g)
This ionic equation can be split into two half equations:

Mg(s) → Mg2+(aq) + 2e- (oxidation)

2H+(aq) + 2e- → H2(g) (reduction)

Notice that:

magnesium atoms lose electrons - they are oxidised

hydrogen ions gain electrons - they are reduced

Reduction and oxidation happen at the same time, so the reactions are called redox reactions

Use half equations to explain why the reaction of zinc with sulfuric acid is a redox reaction.
When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved.
2 ml of ethanoic acid was taken in each of the three test tubes a,b and c, and 2 ml,4 ml and 8 ml water was added to them respectively. A clear solution is obtained in  __________ .
HCl reacts with Na metal to produce:
Which metal is preferred for the preparation of hydrogen from acid?
A student was given Mg, Zn, Fe and Cu metals. He puts each of them in dil.HCl contained in different test tubes.
Reactions of metals with acids

Dilute acids react with relatively reactive metals such as magnesium, aluminium, zinc and iron. The products of the reaction are a salt plus hydrogen gas.
metal + acid → salt + hydrogen
Here’s a good way to remember it: MASH (M+A→S+H).
The name of the salt depends on the name of the acid. For example:
magnesium + hydrochloric acid → magnesium chloride + hydrogen
Mg + 2HCl → MgCl2 + H2
zinc + sulfuric acid → zinc sulfate + hydrogen
Zn + H2SO4 → ZnSO4 + H2
In general, the more reactive the metal, the faster the reaction. However, aluminium has a protective oxide layer, so it reacts slowly with acids to begin with.

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