Under the action of mixed enzymes reactant A is converted to products as follows:

$A{?}_{k_1}^{+\text{e}\text{n}\text{z}\text{y}\text{m}\text{e}}R{?}_{k_2}^{+\text{e}\text{n}\text{z}\text{y}\text{m}\text{e}}S,n_1=n_2=1$

where the rate constants are dependent on the $pH$ of the system.

a$.$ What reactor set$-$up $($plug flow, mixed flow, or staged mixed flow units$)$ and what uniform $pH$ level would you use?

b$.$ If it were possible to change the $pH$ level along the plug flow reactor, or from stage to stage in mixed flow units, in what direction would you change the $pH$ level?

$8\mathrm{.}10.$

$k_1=p{H}^2-8pH+23$

$k_2=pH+1$

with $R{k}_1=pH+1$

$k_2=p{H}^2-8pH+23S2,$ and $S$ the$2,$ and $R$ the

$8\mathrm{.}11.$

$k_1=pH+1$

$k_2=p{H}^2-8pH+23$

with $2,$ and $S$ the