initial commit / add all books

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diff --git a/615/CH2/EX2.4/2_4.sce b/615/CH2/EX2.4/2_4.sce
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+//acids and bases//

+//example 2.4//

+H1=0.005;//H+ ion concentration of solution in g.ion/lit//

+pH1=-log10(H1);

+printf("The pH value of solution whose H+ ion concentration is 0.005g.ion/lit is %f",pH1);

+H2=3*10^-4;//H+ concentration of the solution//

+pH2=-log10(H2);

+printf("\nThe pH of a solution in which H+ is 3*10^-4 is %f",pH2);

+pOH2=14-pH2;

+printf("\npOH of the solution is %f",pOH2);

+k=10^-14;//dissociation constant of water//

+OH2=k/H2;

+OH2a=OH2/10^-11;

+printf("\nOH- concentration for a solution is %f*10^-11M",OH2a);

+OH3=0.1//hydroxyl concentration of a solution//

+H3=k/OH3;

+pH3=-log10(H3);

+printf("\npH of the solution whose hydroxyl concentration is N/10g.ion/lit is %f",pH3);

+k4=1.8*10^-5//dissociation constant of acetic acid at 180C//

+N4=0.1;//normality of acetic acid//

+V4=1/N4;

+a4=sqrt(k4*V4);//formula for degree of dissociation//

+H4=N4*a4;//H+ ion concentration//

+pH4=-log10(H4);

+printf("\npH of 0.1N acetic acid solution is %f",pH4);

+N5=0.01;//normality of acetic acid//

+V5=1/N5;

+a5=sqrt(k4*V5);//formula for degree of dissociation//

+H5=N5*a5;//H+ ion concentration//

+pH5=-log10(H5);

+printf("\npH of 0.01N acetic acid solution is %f",pH5);

+N6=0.001;//normality of acetic acid//

+V6=1/N6;

+a6=sqrt(k4*V6);//formula for degree of dissociation//

+H6=N6*a6;//H+ ion concentration//

+pH6=-log10(H6);

+printf("\npH of 0.001N acetic acid solution is %f",pH6);
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