1.10 A Frio water from the Texas field in Arkansas has a meas- ured resistivity of 0.131 2-m at 68F and the following ionic composition. Ionic Constituent Na Ca Mg Cl SO4 HCO3 CO3 Concentration (ppm) 21,899 2,499 382 38,292 381 1,098 0 4 n=64,501 64,551 a. Using the multipliers method, calculate the equivalent NaCl concentration of this water. b. Estimate the resistivity of this water at 68F from its chem- ical analysis. c. If only the chloride content (i.e., Cl=38,292 ppm) had been known for this water, what resistivity would you estimate, assuming that the water contains only NaCl salt? d. For electric log interpretation, can this water be consid- ered pure NaCl? Explain.