# Graphs Ca concentration in equilibrium with calcite
#  as function of CO2 pressure
#
SOLUTION 0 # Calculate the equilibrium line...
EQUILIBRIUM_PHASES 1
 Calcite
REACTION 1
 CO2 1; 3.5e-3 in 30
USER_GRAPH
 -chart_title "Calcite Equilibrium"
 -axis_titles "CO2 / vol%" "Ca / mM"
 -axis_scale x_axis 0 3 1
 -axis_scale y_axis 0 3 1
 -initial_solutions false
 -headings CO2  equilbrium
 -start
 10 graph_x 100 * sr("CO2(g)")
 20 graph_y 1e3 * tot("Ca")
 -end
END

SOLUTION 2 # point B in Figure 5.14...
 pH 7 charge; Ca 1 Calcite; C(4) 1 CO2(g) -1.7
USER_GRAPH
 -head CO2 mixing_line
 -connect_simulations; -initial true
END

SOLUTION 1 # point A in fig 5.14...
 pH 7 charge; Ca 1 Calcite; C(4) 1 CO2(g) -3.5
END

USER_GRAPH
 -head CO2 1:1
 -connect_simulations false
END

MIX
 1 0.5; 2 0.5
END