Acid Concentration and Rust Formation

In a study examining the impact of various acid concentrations on the rate of rust formation on metal surfaces, researchers set up an experiment with four different concentrations: 0% (control), 1%, 5%, and 10%. Over a 48-hour period, they measured the mass loss of metal samples due to rusting, documenting the results in a table. The results showed a clear trend where increased acidity corresponded to higher mass loss. The table displayed the following mass loss (in grams) for each concentration: 0% - 0.1g, 1% - 0.5g, 5% - 2.0g, and 10% - 4.5g. Based on this data, what can be inferred about the relationship between acid concentration and the rate of rust formation?