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diff --git a/615/CH2/EX2.13/2_13.sce b/615/CH2/EX2.13/2_13.sce
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+//acids and bases//
+//example 2.13//
+k=1.8*10^-5;//dissociation constant of acetic acid at 18C//
+N=0.25;//normality of acetic acid solution//
+V=1/N;
+a=sqrt(k*V);//formula of degree of dissociation for weak acids//
+a1=a/10^-3;
+printf("Degree of dissociation of acetic acid is %f*10^-3",a1);
+H=N*a;
+H1=H/10^-3;
+printf("\nH+ concentration of the solution is %f*10^-3g.ion/litre",H1);
+N2=0.25//normality os sodium acetate added//
+printf("\nIn presence of completely dissociated sodium acetate,acetic acid will be practically unionisad.Thus,all the acetate ions are obtained from dissociation of sodium acetate.");
+CH3COO=N2;
+printf("\nConcentration of CH3COO- is %fg.ion/litre",CH3COO);
+CH3COOH=N2;
+printf("\nConcentration of CH3COOH is %fg.ions/lit",CH3COOH);
+H2=k*CH3COOH/CH3COO;
+H3=H2/10^-5;
+printf("\nH+ ion concentration after adding sodium acetate is %f*10^-5",H3);
+a2=H2/N2;
+a3=a2/10^-5;
+printf("\nDegree of dissociation after adding sodium acetate is %f*10^-5",a3);
+\ No newline at end of file