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diff --git a/Thermodynamics_for_Chemists/ch17.ipynb b/Thermodynamics_for_Chemists/ch17.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:5d3d45dd2b0a1624f92837d3a7578318e5309e0f2974bf7ce73a51b4be600cda"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 17 : The Debye Huckel Theory"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 17.1 Page No : 416"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "import math \n",
+      "s = 1.771*10**-4 \t\t\t#mole litre**-1\n",
+      "s1 = 0.3252*10**-2 \t\t\t#mole litre**-1\n",
+      "\n",
+      "# Calculations\n",
+      "S = s*10**(0.509*(math.sqrt(s+s1)-math.sqrt(s)))\n",
+      "\n",
+      "# Results\n",
+      "print  'Solubility  = %.2e mole litre**-1'%(S)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Solubility  = 1.87e-04 mole litre**-1\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 17.2 Page No : 420"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "import math \n",
+      "a = 0.1\n",
+      "\n",
+      "# Calculations\n",
+      "r = 10**(-0.509*math.sqrt(a)/(1+math.sqrt(a)))\n",
+      "\n",
+      "# Results\n",
+      "print  'mean ionic acctivity coefficient  = %.3f '%(r)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "mean ionic acctivity coefficient  = 0.755 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file