I am wondering about purity grades for extractions as well. How can I find the percentage purity of NaOH? The 250cm³ sample must have contained 10X the amount of NaOH in the 25cm³ sample. NaOH of unknow concentration. View information & documentation regarding Sodium hydroxide, including CAS, MSDS & more. I've been stuck on this question for hours. Most online soap recipe calculators assume the NaOH purity is 100%, but that is seldom true, even for NaOH shipped fresh from the manufacturer. I then titrated 0.1M HCl with 25.0cm3 Naoh (0.1M). A standard solution has a concentration that is exactly known. They also have industrial grade Calcium Hydroxide for about 50c per kilo. Mol NaOH in 250cm³ sample = 4.92*10^-3*10 = 4.92*10^-2 mol NaOH Average NaOH molarity calculated to be 0.09515 M. Titrations performed by Yu-Ting Tseng and taken for comparison The standard deviation for both data sets was calculated by the method shown below using Equation 1. From the equation, 2mol NaOH react with 1 mol H2SO4. Normality, N, expresses a concentration of a solution. I know of some soapers who actually have their own personal spreadsheets set up to allow for lye purity in the calculations and do test their lye for purity. Therefore the 25cm³ sample contained 2*2.46*10^-3 = 4.92*10^-3 mol NaOH. Adjusting your recipe for NaOH purity. Because NaOH has one OH ion that reacts, the equivalent weight is 40 g/eq. NaOH is a strongly basic versatile inorganic compound often referred to as caustic soda, lye, or sodium hydrate. The standard NaOH solution will be used to determine the purity of an impure solid acid and the standard HCl solution will be used for analyses later on in the semester. I can only find two lye calculators that allow for changing NaOH lye purity, and in some cases this is a useful feature. Sigma-Aldrich offers a number of Sodium hydroxide products. This common laboratory alkali is used for general cleaning of equipment, buffer solutions, and titrations, among other uses. 3. In this experiment, you will prepare standard solutions of sodium hydroxide (NaOH) and hydrochloric acid (HCl). The calculators' assumption of 100% purity builds in a "hidden" superfat in addition to the superfat you type when you create a recipe. This sample calculation uses the … In the home, NaOH is found in … In order to solve a normality calculation for NaOH, the equivalent weight must be calculated. I can get 99.4% pure NAOH from a chemical company, but they have it listed as industrial grade. In an experiment I weighed 1.1g of NaOH, dissolved in a beaker and made up to 250mls into a volumetric flask using de-ionised water. Calculater the percentage, by mass, of NaOH in the impure caustic soda. It's just over a dollar for a kilo. Normality is defined as the gram equivalent weight per liter of solution. I got a final average burette reading of 24.6cm3.