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diff --git a/2966/CH3/EX3.20/3_20.sce b/2966/CH3/EX3.20/3_20.sce
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+//lubricants//
+//page 3.38 example 10//
+clc
+S_C=191//Saponification value of castor oil//
+wt_oil=2.5//weight f oil saponified(gms)//
+blank=40//volume blank titration reading(ml)//
+back=24//volume back titration reading(ml)//
+volume=blank-back//volume of alcoholic KOH consumed(ml)//
+N=0.5//normality of KOH for equivalence//
+S_blended=volume*N*56/wt_oil//formula for saponification value//
+printf("\nSaponification value of blended oil is %.1f mg/g",S_blended);
+pc_C=(S_blended/S_C)*100
+printf("\npercentage of castor oil in blend is %.2f percent",pc_C);
+\ No newline at end of file