The error in Jaquan's procedure is that they have mentioned two different quantities of acid being added to the test tubes. You stated that "five of them of acid" were added, but it doesn't specify the unit of measurement (e.g., mL). It would be helpful to have a consistent unit of measurement mentioned for the acid, just like the 5 mL mentioned for water.
The error in Jaquan's experiment is that he put 5 mL of water into three test tubes, but then put five units of acid into only two of the tubes. This means that one of the test tubes has no acid in it, which is not consistent with the other tubes.
