4 groups of 4 beakers were filled with 200mL of distilled water. 0.6mL of citric acid was dissolved in one group, 2.5mL in another, and 5mL in another. The last group, the control, was left as pure water.
I measured the solutions pHs and they were 6.2, 6.1, and 6.0, respectively. Pure water had a pH of 6.4.
I placed the groups in the freezer (25° F) and checked them every 10 minutes (min.) for frost. I assumed that there was a correlation between when the solutions froze and their freezing point.
Those that took the longest time to freeze had the lowest freezing points.