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help chemestry a level-Reaction orders

It takes 200 seconds to completely dissolve a 0.4g piece of magnesium in 25cm^3 of dilute hydrochloric acid. It takes 100 seconds if the concentration of the acid is doubled.
a) what is the order of the reaction with respect to the concentration of the acid?
c) what physical parameter could be measured to follow the rate of this reaction in more detail?
When the acid concentration is doubled then the time halves, so the rate has doubled so the order is 1
To follow it in more detail measure the volume of hydrogen produced over time (using a gas syringe).

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