7) (15 points) A chemical analysis of a surface water with pH=10.5 yields the following data: a) Determine the alkalinity, expressed as CaCO3. Hint: You will need to calculate the

abundance of CO3²- using pKa=10.33 for the dissociation of HCO3 into H* and CO3². b) Determine the hardness as CACO3. How would you characterize this water based on hardness (refer to the slides from class or from Lab #3)?