# Chemical Reactions

#### The inflow of carbon dioxide per unit volume is denoted as follows.

 In:= XFin = klA (pCO2/H - CO2[t]);

#### Specify the rate equations for each of the reactions.

 In:= Xr1 = k1 FLB[t]^2 CO2[t]^0.5; r2 = k2 FLBT[t] ZHU[t]; r3 = (k2/KK) FLB[t] ZLA[t]; r4 = k3 FLB[t] ZHU[t]^2 CO2[t]; r5 = k4 FLBZHU[t] CO2[t]^0.5;

#### The governing equations for the rate of change of concentrations of each chemical species depends on the rate equations and the reactions.

 In:= Xeqns = {FLB'[t] == -2 r1 + r2 - r3 - r4, CO2'[t] == -0.5 r1 - r4 - 0.5 r5 + Fin, FLBT'[t] == r1 - r2 + r3, ZHU'[t] == -r2 + r3 - 2 r4, ZLA'[t] == r2 - r3 + r5};

#### The last reaction represents an equilibrium reaction.

 In:= XeqEqn = Ks FLB[t] ZHU[t] == FLBZHU[t];

#### Define the reaction parameters for each of the reactions.

 In:= Xparams = {k1 -> 18.7, k2 -> 0.58, k3 -> 0.09, k4 -> 0.42, KK -> 34.4, klA -> 3.3, Ks -> 115.83, pCO2 -> 0.9, H -> 737};

#### Specify the initial concentrations of each species.

 In:= Xics = {FLB == 0.444, CO2 == 0.00123, FLBT == 0, ZHU == 0.007, ZLA == 0};

#### Solve and visualize the change in concentration of the species over time.

 In:= Xsol = NDSolve[{eqns, eqEqn, ics} /. params, {FLB, ZHU, , CO2, ZLA}, {t, 0, 200}];
 In:= XRow[Plot[Evaluate[#[t] /. sol], {t, 0, 200}, PlotRange -> All, PlotLabel -> #[t]] & /@ {FLB, ZHU, CO2, ZLA}]
 Out= 