Add 2-3 drops of phenolphthalein indicator and titrate with sodium hydroxide present in the burette. recorded. Question: Table A: Standardization Of Sodium Hydroxide (NaOH) Solution With Potassium Hydrogen Phthalate (KHC.H.O. Transfer 20 ml of 0.5 N oxalic acid to a conical flask. HCl and NaOH reacts in 1:1 ratio (in same amount). HCl and NaOH are strong acid and strong base respectively and their titration curves are similar (shape of curve) in different concentrations. Indicator selection depends on the presence of carbonates in the sodium hydroxide solution. Important factors and equations of HCl + NaOH reaction and its titration curve. NaOH + HCl = NaCl + H 2 O. With this data, the volume of NaOH used can be calculated. Note the end point when a pale pink color is observed. THE PREPARATION AND STANDARDIZATION OF NaOH AND HCL SOLUTION AIMS & OBJECTIVES: (1) To gain experience with titration procedure (2) To learn to standardize acid & base solution (3) To carry out the preparation of solution of a desired concentration (4) To carry out the preparation of solutions of desired concentration from more concentrated solution INTRODUCTION: … If the solution is carbonates free, end point volume will be identical in both cases. Sodium hydroxide , as a solid and in solution, looses strength on exposure and its concentration needs to be determined or standardised by titration, using a hydrochloric acid (HCl) solution of a known concentration (0.1 M). Initial Burette Reading Of NaOH (mL) 0.0 ML 0.0 Ml. (Primary Standard) (Titation Of KHC HOA (KHP) Vs. NaOH) SN Experiment Data Trial 1 Trial 2 1. In the presence of carbonates, titration against phenolphtalein will end faster. Using the formula C1V1 = C2V2, where C1 is the molarity of the NaOH, the difference in volume is the V1 and the amount of aqueous solution that was measured in the Erlenmeyer flask is the V2. 1, - Fill a 25mL or 50mL burette with 0.1M HCl soln. In this experiment, standardization of a NaOH solution will be carried out either using KHP as the primary standard or by using a standard HCl solution of known concentration. and zero or note the burette reading. Volume Of KHP 10.00 ML 10.00 Ml 3. Repeat the experiment until three concordant reading. Tabulation for standardization A primary standard could be any pure chemical that can be used as the initiation of a quantitative analysis. NaOH + HCl → NaCl + H 2 O. NaOH solution should be titrated against methyl orange or phenolphthalein. Standardization. Standardisation of Sodium Hydroxide(NaOH. Molarity Of KHP (mol) 0.1 M 0.1 M 2. Both reactants and products are in aqueous state. Standardisation Procedure . The reaction between solutions of HCl and NaOH is illustrated by Equation 1. A standard solution has an accurately known concentration and for this experiment sodium hydroxide was standardized with a primary standard acid, potassium hydrogen phthalate.