Question $3$

Marked out of $6\mathrm{.}00$

From the table in Mac Berthouex and Brown $(2013)$ where the parameters for calculating acute and chronic toxicity values as function of water hardness can be found, the parameters for zinc for the acute and chronic toxicity criteria are given as: $m_A=0\mathrm{.}8473,b_A=0\mathrm{.}884$ and $C_{CMC}=0\mathrm{.}978,m_c=0\mathrm{.}8473,b_c=0\mathrm{.}884$ and $CFCCC=0\mathrm{.}986,$ where:

$q=m_{A}ln($hardness$)+b_A$

$CMC=e^{q}C{F}_{CMC}$

$r=m_{c}ln($hardness$)+b_c$

$CCC=e^{r}C{F}_{CCC}$

If the water hardness is $62\mathrm{.}5m\frac{g}{L}CaC{O}_3,$ what is the acute toxicity criterion?

Rounded off to $5$ significant figures:

If the water hardness is $62\mathrm{.}5m\frac{g}{L}CaC{O}_3,$ what is the chronic toxicity criterion?

Rounded off to $5$ significant figures:

Rounding to the correct number of significant figures for the data in the question: