Refer to the Minerals Engineering (Vol. 46-47, 2013) study of the impact of calcium and gypsum on the flotation properties of silica in water, Exercise 2.48 (p. 53). The zeta potential (mV) was determined for each of 50 liquid solutions prepared without calcium/gypsum and for 50 liquid solutions prepared with calcium/gypsum. a. Find the mean, median, and mode for the zeta potential measurements of the liquid solutions prepared without calcium/gypsum. Interpret these values.
b. Find the mean, median, and mode for the zeta potential measurements of the liquid solutions prepared with calcium/gypsum. Interpret these values.
c. In Exercise 2.48, you used graphs to compare the zeta potential distributions for the two types of solutions. Now use the measures of central tendency to make the comparison. How does the addition of calcium/gypsum to the solution impact water quality (measured by zeta potential of silica)?