Universal Indicator pH Paper: The first paper (strong base) appeared to work well, but the second and fourth papers were difficult to differentiate from one another as neither appeared to change much other than looking a little damp. The third paper was clearly identifiable as a strong acid because of the immediate, concentrated red pigment. The fifth paper (I thought this was a strong base) looked similar enough to the first paper not to warrant a distinction between them in my final answer. I found the universal indicator pH paper to be useful for identifying strong acids; however, the colour scheme of the legend is not ideal for distinction between strong/weak bases, the solution bled through every paper, the blue/green colour was difficult to differentiate, and the papers changed over time. Unknowns one and five appeared to be strong bases at first and unknowns two and four appeared placing the focus solely on cost. In this brief study, for instance, the authors were generally able to identify whether a solution was strongly basic or acidic, and this may be all that is required for the lesson.