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Experimental data and order determination

So I am about to run an experiment:

the equation is
2Mg+2H3O^+ ---> Mg^2+ + H2 + 2H2O

v=dp(H2)/dt = K(Smg)^a[H+]^b

with regards to finding the order with respect to H+ i know i have to use the initial rate data which was measured with constant Surface area of magnesium (Smg), constant temperature and a variable [H+]

Therefore i need to plot a graph of Ln(initial rate) vs Ln[H+]

how can i use the line of best fit from this graph to determine the order b with respect to H+

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