[RandomDude1234]

Hello, I am trying to determine the activation energy of the magnesium and hydrochloric reaction by measuring the volume of gas produced at different temperatures. In order to to this, I need the rate law (to find the rate constant at different temperatures), however, I have found multiple different rate laws for this reaction. In a worked example from a question in my chemistry textbook it says rate = k(HCl)2, on other online sources/forums, it says rate = k(HCl), and some even include magnesium, or H+ ions into the rate law. If someone could guide me to the correct rate law that would be much appreciated, as I do not have the word count available to include determining the rate law in my lab report. Thank you.

[mjc123]

The actual rate law doesn't matter, as long as it is the same across all your experimental conditions. If you use the same HCl concentration in all experiments, then
Rate = constant*e^-E_a/RT
and the actual value of constant doesn't matter. Plot log(rate) vs. 1/T.