SOLUTION 1 temp 25 pH 7 charge pe 4 redox pe units mmol/kgw density 1 Na 10 Si 5 N(5) 15 Mg 30 -water 1# kgRATES Periclase-start 1 rem PARM(1) = normalized surface area 10 if (M <= 0)then goto 100 20 if (SI("M075SH") >= 0)then goto 100 30 si_MSH075 = SI("M075SH") 40 if M > 0 then area = PARM(1)*M 50 rate = 10^(-0.9877436 * (-LA("H+"))- 3.9806115) * area 60 moles = rate * TIME100 SAVE moles-endKINETICS 1 Periclase -tol 1e-8 -m0 0 -m 6.38e-3 -parms 3.005e5 # normalized surface area (cm^2) -steps 3600 in 10 steps # steps are in seconds, 10 hoursUSER_GRAPH 1 -headings Reaction MSH(0.75) MSH(1.5) Brucite pH -chart_title "MgO Dissolution" -axis_titles "Time (s)" "Saturation Index " "pH" -initial_solutions true -start 10 graph_x SIM_TIME 20 graph_y SI("M075SH") SI("M15SH") SI("Brc") 30 graph_sy -LA("H+") -end