When Amanda poured some of the liquid in a test tube, she noticed that the edges of the water curved upward, which is an example of cohesion . When Pol filled another test tube to the top, the liquid formed a low dome, which is evidence of adhesion . When Amanda added table salt to the first test tube and shook it, she noted that the liquid had dissolved the solute . All of these observations indicated the presence of ionic bonds. Pol determined that the pH of the sample is 7, which shows the sample is neutral . Based on all of the evidence Amanda and Pol gathered, the unknown liquid is water .