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diff --git a/615/CH2/EX2.5/2_5.sce b/615/CH2/EX2.5/2_5.sce
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+//acids and bases//
+//example 2.5//
+K1=10^-8;//dissociation constant of weak mono basic acid//
+N1=0.01;//normality of the acid//
+V1=1/N1;
+a1=sqrt(K1*V1);//degree of dissociation for weak acids//
+H1=N1*a1;//H+ concentration of the solution//
+pH1=-log10(H1);
+printf("pH value of 0.01N solution of a weak mono basic acid is %f",pH1);
+a2=4/100;//percentage of dissociation of acid at 20C//
+N2=0.1;//normality of acid//
+V2=1/N2;
+K2=(a2^2)/V2;
+K2a=K2/10^-4;
+printf("\nThe dissociation constant of the acid is %f*10^-4",K2a);
+N3=0.1;//normality of HCl//
+pH3=-log10(N3);
+printf("\nThe pH of the 0.1N HCl solution is %f",pH3);
+N4=1/50;//normality of HCl//
+pH4=-log10(N4);
+printf("\nThe pH of the 1/50N HCl solution is %f",pH4);
+N5=0.01;//normality of H2SO4//
+pH5=-log10(N5);
+printf("\nThe pH of the 0.01N H2SO4 solution is %f",pH5);
+\ No newline at end of file