Learn about the preparation and standardization of 0.1 M sodium hydroxide through a laboratory experiment or practical. Aim:To prepare and standardization of 0.1 M sodium hydroxide solution (NaOH) using the primary standard potassium hydrogen phthalate. Requirements:Glasswares: Burette, burette stand, conical flask, volumetric pipette, beaker, volumetric flask, funnel, glass rod, and wash bottle, etc. Chemicals: LR grade sodium hydroxide (NaOH), potassium hydrogen phthalate (KHP), and phenolphthalein indicator, etc. Apparatus: Digital/analytical balance, and Ultrasonicator. Principle:Potassium hydrogen phthalate is directly titrated with sodium hydroxide to determine its strength. Using phenolphthalein as an indication, the endpoint of the titration is determined. The following is the reaction that is involved in this titration. The molecular weight of sodium hydroxide (NaOH) is 39.997 g/mol. Preparation of 0.1 M NaOH:
Titration procedure:
Observation table:Molarity of NaOH = W x RM / V x E Where, W is a weight of primary standard E is an equivalent factor of primary standard RM is a required molarity V = volume of NaOH used For 0.1 M NaOH, the equivalent factor of PHP is 0.020422. Result:-The strength of the prepared sodium hydroxide solution was found to be_____M. Commonly asked quetions on titration are as follows. Why does the NaOH solution need to be standardized? To determine the exact concentration (Molarity/Normality) of NaOH solution it needs to be standardized. Because solid NaOH is extremely hygroscopic, it cannot be precisely weighed. The concentration of sodium hydroxide may be determined extremely precisely by titrating a KHP sample of known mass/mole with the NaOH solution. What is standardization? The process of determining the precise concentration (molarity) of a solution is known as standardization. What are the types of titration? Based on the chemical reaction taking place between the titrant and solute or analyte, there are four types of titrations such as acid-base, redox, complexometric, and precipitation. You may also like this Preparation and standardization of 0.1 m H2SO4 Preparation and standardization of 0.1 N sodium thiosulphate Preparation and standardization of 0.1 N potassium permanganate Preparation and standardization of 0.1 M ceric ammonium sulphate Preparation and standardization of 0.05 M EDTA solution Preparation and standardization of 0.1 M perchloric acid Preparation and standardization of 0.1 M silver nitrate Prepare and standardize 0.1 M sodium thiosulphate Prepare and standardize 1M sulphuric acid Prepare and standardize 1M potassium permanganate
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Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips. Visitors are also reading: |