Question

Preparation of Sodium Hydroxide Titrant: Prepare 500 mL of a 0.1 M sodium hydroxide solution by dilution of a 1 M sodium hydroxide stock reagent or from solid NaOH. This dilution need only be performed to 5% accuracy, that is, using a graduated cylinder and an Erlenmeyer flask. Store the diluted solution in a polyethylene bottle. Standardize the diluted solution against dry, solid KHP (potassium hydrogen phthalate) using phenolphthalein as an indicator and label the bottle with the concentration of sodium hydroxide together with the accuracy (as represented by the 95% confidence limit).

Please explain the purpose of standardization. After standardization, a titration was performed with the above titrant and the analyte was KHP with unknown concentration. Please explain why it was important to standardize before performing the next titration.

Answer 1

OLM Sodium hydroxide solution → Ured in nomalisation : Standardisation or Titer determination is one of the precondition for reliable 8 barsparent titration resulta In volumetric titration, acurate titation resuths are only achieral When we work with exact concentration of the volumetie sola- To prepare onlm Naon in loomL volumetrie flank man olut + 1000 M=7 x 10 x = 0.1X40 = 4-0-49 40 Take 0.49 Naon pallets in 100ml volumetrii fark and duidue with little amount of distilled water. Later, file the volumetnii fark upto the mark. * By this method we now have a standard or a reference uring which we find out the Molarity concentration of unknown sample. (In this care KHP) Formulae med (M. V.) naon (MLV2) kup (( м.) Еке = (м, v) маси Ило, м, - Mi идиллии um" | ги Р Come of Naon (standardied ) =0.1M consumed from beaker = xml. Vivo Juan V2 → vol of KUP taken in wonical in zlom which indicator (phenol thalein) is added