8. For each of the two water samples below, (a) and (b), calculate (pts per water sample): i. (3 pts) meq/ Lof2+,Mg2+, and alkalinity ii. (1 pts) meq/LfCO2 (see Davis text for refresher on carbonate species equilibrium from ENVE 2100) iii. (2 pts) a plot of the bar graph, showing key numerical values iv. (4 pts) meq/L required chemical addition of lime (Ca(OH)2) to achieve softening v. (4pts)meq/L required chemical addition of soda ash (Na2CO3) to achieve softening vi. (4 pts) kg/L of total solids produced in the softening process, considering that 7mg/L. of suspended solids is also removed through coagulation in the lime-soda softening process vii. (2 pts) actual chemical additions if lime is 88% pure and soda ash is 98% pure viii. ( 2 pts) the annual cost to treat 0.5m3/s(11.5MGD) of water if lime is $61.70 per megagram (Mg) and soda ash is $172.50 per megagram (Mg) ix. ( 2pts)meq/L of CO2 added to water to convert half of the 0.6meq/L of carbonate in the finished water to bicarbonate and to react with the 1.45meq/L of OH-ions in the finished water to avoid pipe corrosion