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diff --git a/1427/CH5/EX5.13/5_13.sce b/1427/CH5/EX5.13/5_13.sce
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index 000000000..94f2b0745
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+++ b/1427/CH5/EX5.13/5_13.sce
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+//ques-5.13
+//Calculating pH of buffer solution
+clc
+Ka=1.8*10^-5;
+v1=30;//volume of NaOH (in mL)
+M1=0.1;//molarity of NaOH
+v2=100;//volume of acetic acid (in mL)
+M2=0.1;//molarity of acetic acid
+t=v1+v2;//total volume (in mL)
+v3=v2-v1;//volume of actic acid unreacted (in mL)
+c1=(v1*M1)/t;//content of acetate ion
+c2=(v3*M2)/t;//content of acetic acid unreacted
+p=-log10(Ka)+log10(c1/c2);
+printf("The pH of the buffer solution is %.4f.",p);