1. Estimate the alkalinity, expressed as mg/L of CaCO3, of the following sample (Ca*2 =190.2; Mg*2 = 84.1; Na* = 75.2, K* = 5.1; Fe*2 = 0.2; HCO3 = 260;

SO,² = 64; Cl` =440.4; NO3 = 35.1; CO3² = 30 mg/L)