$(21$ pts$)$

a$.$ A solution of HOCl is prepared in water by adding $25$mgHOCl to a volumetric flask, and adding water to $1L$ mark. The percent of the HOCl is dissociated is $25\%.$ Calculate $($a$)$ The final $pH($b$)$ The concentrations of HOCl and $[OC{l}^{-}].K_A={10}^{-7\mathrm{.}6}$

b$.$ The concentration of Ozone $(O_3)$ in Beijing on a summer day atm is $0\mathrm{.}250m\frac{g}{m^3}.$ What is the ozone concentration in units of $($a$)pp{b}_v(b)\frac{g}{m^3},($c$)$ moles of $O_3$ per ${10}^6$ moles of air. The atomic weight of oxygen is $16.R=8\mathrm{.}205{10}^{-5}$atm.$\frac{m^3}{m}$ole.$K$

c$.$ The following information is from a laboratory test to determine the suspended solids concentration of a sample of untreated wastewater. A $100mL$ sample is filtered through a filter pad. The weight of the clean filter and crucible, both were dried and cooled and then weighed, is $48\mathrm{.}500g.$ After filtration, drying at $104C,$ and cooling, the weight of the crucible, filter, and dried solids is $48\mathrm{.}950g.$ This crucible is then placed in a furnace at $550C$ and then cooled and weighed. The final weight was $48\mathrm{.}750g.$

i$.$ What is the concentration of the suspended solids in ppm$?$

ii$.$ What is the concentration of the volatile suspended solid in ppm$?$

iii. What is the fixed suspended solids in