reaction between acid&metal F4

1.
Both reactions give the same amount of hydrogen gas, and the reaction using a strong acid will give a faster reaction.

The acid is in excess, and thus the metal is the limiting reactant. Since the same amount of the metal is used, both the reactions give the same amount of hydrogen gas.

The reaction is actually between the metal of hydrogen ions in the acid. A strong acid give a higher concentration of hydrogen ions, and this leads to a faster reaction.

2.
Both reactions also give the same amount of hydrogen gas, and the reaction using a strong acid will give a faster reaction.

The acid is in excess, and thus the metal is the limiting reactant. Since the same amount of the metal is used, both the reactions give the same amount of hydrogen gas.

HCl is completely ionized in water to give hydrogen ions, but CH3COOH is partly (about 5%) ionized in water. Therefore, the concentration of hydrogen ions in 0.1 M HCl is expected to be higher than that in 0.2 M CH3COOH. 0.1 M HCl would have a faster reaction rate, as its concentration of hydrogen ions is higher.
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