Magnesium reacts with hydrochloric acid to produce hydrogen gas. An experiment w

Question

Magnesium reacts with hydrochloric acid to produce hydrogen gas. An experiment was set up to determine the rate of production of the hydrogen gas by measuring its change in volume over the first 60 seconds of the reaction. Mg ribbon was cut into squares of 0.5cm^2 and 1.0cm^2. The volume of hydrochloric acid solution and the total mass of Mg were held constant in each trial. Which set of conditions would produce the highest rate of production of hydrogen gas?

A.) 1 M HCl, 0.5-cm^2 pieces of magnesium

B.) 1 M HCl,1.0-cm^2 pieces of magnesium

C.) 3 M HCl, 1.0-cm^2 pieces of magnesium

D.) 3 M HCl, 0.5-cm^2 pieces of magnesium

Explanation / Answer

Answer – We are given the Mg ribbon was cut into squares of 0.5cm2 and 1.0cm2. The 1 and 3 M solution of HCl. . The volume of hydrochloric acid solution and the total mass of Mg were held constant in each trial.

We know the reaction between the Mg and HCl

Mg(s) + 2HCl(aq) -----> MgCl2(aq) + H2(g)

Assume there are same moles of Mg and HCl then the number of moles of H­2 produced form the Mg is with same moles and from the HCl it is half, so the HCl will be limiting reactant and the rate of reaction depend on the concentration of HCl.

So when we take the higher concentration HCl and large size of the Mg ribbon piece, then there is collision between the HCl and Mg increased more and there is reaction goes faster and there is also H2 produced faster. As the area of the Mg metal gets more there is reaction rate increased, since there is reaction between solid and liquid reaction.

So set of conditions would produce the highest rate of production of hydrogen gas is C.) 3 M HCl, 1.0-cm^2 pieces of magnesium

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