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+//Chapter-8,Example 6,Page 196
+clc();
+close();
+
+pH= 7.4 //of blood
+
+H= 10^(-pH)
+
+//assume ratio of HCO3- and H2CO3 is r
+
+Ka= 4.5*10^-7
+
+// Ka = [H+]*[HCO3-]/[H2CO3]
+
+r=Ka/H
+
+printf('the ratio of HCO3- and H2CO3 is %.f',r)