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+//Chapter-8,Example 2,Page 195
+clc();
+close();
+
+H=20*0.1/1000 //as 20 ml of 0.1M HCl
+
+pH=-log10(H)
+
+pOH=14-pH
+
+OH=10^(-pOH)
+
+printf(' the [H+] = %.4f mole/l',H)
+
+printf('\n the [OH-] =')
+
+disp(OH)
+
+printf(' mole/l')
+
+printf('\n the pH = %.f ',pH)