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diff --git a/2966/CH3/EX3.19/3_19.sce b/2966/CH3/EX3.19/3_19.sce
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+//lubricants//
+//page 3.38 example 9//
+clc
+S_C=188//Saponification value of castor oil//
+wt_oil=12.3//weight f oil saponified(gms)//
+blank=45//volume blank titration reading(ml)//
+back=30.2//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 %.2f 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