ENCE 433 Dr. Alba Torrents

ENVIRONMENTAL ENGINEERING ANALYSIS Fall 1996

Homework Set # 5 SOLUTION

H₂O Ca(OH)₂ pH

Ca(OH)₂ will dissolve and form OH^-; thus the pH will increase

CO₂(open) NaCl Alkalinity and C_T

No change in either if the volume of the solution does not change

Alkalinity would decrease and C_T would not change if we add a dilute solution of NaCl

CO₂(open) NaOH Alkalinity and C_T

The pH will increase and with it a₂; thus alkalinity will increase

As we are in an open system, more CO₂ will dissolve and C_T will increase

H₂O closed H₂O Alkalinity and C_T

Both will decrease due to a dilution of the system. The same number of moles in a larger volume