Calculated rate of reaction for Chem Lab 7 - Results and graph here: https://goo.gl/NlgIoD

rates.c

#include <stdio.h>

#define RATE_CONSTANT 20 //in L/(mol*s)
#define TIME_STEP 0.001 //in s

double hso3minus = 0.01; //in mol /L
double io3minus = 0.015; //in mol/L
double time = 0.001; //in seconds
double rate = 0; //in mol/(L*s)

int main() {
        while(hso3minus > 0.0025) {
                rate = RATE_CONSTANT * hso3minus * io3minus * TIME_STEP;
                hso3minus -= (rate * 3); //decreases 3 times as fast as IO3-
                io3minus -= rate;
                printf("%f\t%f\t%f\t%f\n",time,hso3minus,io3minus,rate);
                time += TIME_STEP;
        }
}