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diff --git a/3856/CH8/EX8.9/Ex8_9.sce b/3856/CH8/EX8.9/Ex8_9.sce
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index 000000000..43fdf3da9
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+//Calculate the Mean Activity coefficient of Cupper Sulphate 
+
+//Example 8.9
+
+clc;
+
+clear;
+
+m1=0.010;  //Molarity of the solution in m
+
+z1=2;  //Charge on cation 
+
+z2=-2;  //Charge on anion 
+
+I=(1/2)*((m1*z1^2)+(m1*z2^2));  //Ionic strength of the solution in m
+
+gyma=10^(-0.509*abs(z1*z2)*sqrt(I));  //Mean Activity coefficien of CuSO4
+
+printf("Mean Activity coefficient = %.3f",gyma);
diff --git a/3856/CH8/EX8.9/Ex8_9.txt b/3856/CH8/EX8.9/Ex8_9.txt
new file mode 100644
index 000000000..30c25b787
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@@ -0,0 +1 @@
+ Mean Activity coefficient = 0.392
+\ No newline at end of file