Passage II
Aluminum water-based paints (AWPs) contain aluminum (Al) flakes that give surfaces a shiny, metallic appearance. If the flakes corrode, a dull coating of aluminum hydroxide forms on them:
2Al + 6H2O → 2Al(OH)3 + 3H2
Table 1 shows the volume of H2 gas produced over time (at 25℃ and 1 atm) from 100 mL samples of freshly made AWPs 1-3 in 3 separate trials. AWPs 1-3 were identical except that each had a different concentration of DMEA, an AWP ingredient that increases pH.
The AWP 3 trial was repeated 4 times, but for each trial, the sample had the same concentration of 1 of 4 corrosion inhibitors (see Figure 1).
Figure 1 adapted from Bodo Muller. "Corrosion Inhibitors for Aluminum." ©1995 by Division of Chemical Education, Inc., American Chemical Society.
9. In the trials represented in Table 1 and Figure 1, by measuring the volume of H2, the experimenters were able to monitor the rate at which:
Your Answer is
Correct Answer is C
Explanation
According to the chemical reaction equation in the article, Al should be transformed into Al(OH)3, so choose C