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diff --git a/1427/CH5/EX5.9/5_9.sce b/1427/CH5/EX5.9/5_9.sce
new file mode 100644
index 000000000..f21d901d5
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+++ b/1427/CH5/EX5.9/5_9.sce
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+//ques-5.9
+//Calculating pH of two samples
+clc
+
+//Part (i)
+c=0.001;//molarity of HCl
+p1=-log10(c);//pH of HCl
+
+//Part (ii)
+c=0.04;//molarity of HNO3
+p2=-log10(4*10^12);//pH of HNO3
+printf("pH value of HCl is %.0f and pH of nitric acid is %.3f.",p1,p2);