A few drops of methyl orange are added to a reaction mixture. during the reaction, a gas is produced and methyl orange turns from red to orange. what are the reactants?

a- aqueous sodium hydroxide and ammonium chloride
b- aqueous sodium hydroxide and calcium carbonate
c- dilute hydrochloric acid and magnesium
d- dilute hydrochloric acid and aqueous sodium hydroxide

*please tell the correct answer and its reasoning.

Question

17-05-2022
Chemistry

contestada

A few drops of methyl orange are added to a reaction mixture. during the reaction, a gas is produced and methyl orange turns from red to orange. what are the reactants?

a- aqueous sodium hydroxide and ammonium chloride
b- aqueous sodium hydroxide and calcium carbonate
c- dilute hydrochloric acid and magnesium
d- dilute hydrochloric acid and aqueous sodium hydroxide

*please tell the correct answer and its reasoning.

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ayoushivt ayoushivt · Answer 1 · 2022-05-27T07:32:06+02:00

The reactants are Option C , dilute hydrochloric acid and magnesium which turns methyl orange from red to orange .

What are Indicators ?

Indicators are substances that change colour when they are added to acidic or alkaline solutions.

Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory.

Methyl orange in an acidic medium turns Red or orange , Yellow in neutral medium and Yellow in akaline medium .

Phenolphthalein in an acidic medium turns Colourless , Colourless in neutral medium and Pink in akaline medium .

Magnesium reacts with hydrochloric acid to produce hydrogen gas

Mg (s) + 2 HCl (aq) → MgCl₂ (aq) + H₂ (g)

In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium.

So the solution is acidic and therefore when methyl orange are added to a reaction mixture methyl orange turns from red to orange

Therefore the The reactants are Option C , dilute hydrochloric acid and magnesium which turns methyl orange from red to orange and H₂ gas is produced .

To know more about Indicators

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