Standardization of 1N Potassium Hydroxide Accurately weigh about 5 g of potassium biphthalate, previously crushed lightly and dried at 120° for 2 hours, and dissolve in 75 mL of carbon dioxide-free water. Add 2 drops of phenolphthalein TS, and titrate with the sodium hydroxide solution to the production of a permanent pink color. Titration Data Weight of potassium biphthalate used in the titration: 5.1037 g Volume of potassium hydroxide solution used in the titration: 31.20 mL What is the true concentration, in normality, of the potassium hydroxide solution?

Standardization of 1N Potassium Hydroxide Accurately weigh about 5 g of potassium biphthalate, previously crushed lightly and dried at 120° for 2 hours, and dissolve in 75 mL of carbon dioxide-free water. Add 2 drops of phenolphthalein TS, and titrate with the sodium hydroxide solution to the production of a permanent pink color. Titration Data Weight of potassium biphthalate used in the titration: 5.1037 g Volume of potassium hydroxide solution used in the titration: 31.20 mL What is the true concentration, in normality, of the potassium hydroxide solution?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

2H+ + Na2CO3⟶2Na+ + H2O + CO2 the volume of 28.30 ± 0.06 mL of HNO3 solution was required for complete reaction with 0.8450 ± 0.0009 g of Na2CO3, (FM 105.988 ± 0.001 g/mol). Please Find the molarity of the HNO3 solution along with its absolute uncertainty. 1. [HNO3] = ________________ M 2. ___ ± ____________ M
Method of Standard Addition Worksheet You are provided a stock standard solution containing : 0.0500 g/250 mL acetaminophin (APAP). You need to determine how much standard stock is required to prepare the following solutions using 100 mL flasks. Flask 12 3 4 [APAP] added ppm (mg/L) t 10 20 30 40 RI mL Stock 0.1 What method of calibration do you use if you are analyzing a product and the product contains no ingredients that interfere with the instrument response for APAP in the product? on th LI What method of analysis do you use if you are analyzing a product and the product contains ingredients that interfere with the instrument response for APAP in the product? or
© Macmillan Learning Five standard solutions of a newly discovered inorganic salt were used to create a calibration curve. The density (g/mL) of each solution was plotted on the y-axis versus the % (w/v) concentration on the x-axis. The calibration curve was linear and fitted with the following best-fit line. y = 1.17x + 0.188 A student is asked to analyze a solution of this salt with a density of 4.00 g/mL. What is the concentration, in %(w/v), of the unknown salt solution? concentration: % (w/v)
2. An 84 kg University of Toledo groundskeeper who is spraying a 100 mg/L solution of the insecticide dieldrin (MW = 381; logP = 4.56) on some trees exposes 100 cm“ of his skin to the solution over a 4 hr period. Dieldrin has a half-life of about 6 months, a volume of distribution of about 40 L/kg, and a dermal permeability of about 3 x 10° cm/sec. (a) Estimate the absorption rate during the exposure period assuming the blood concentration is much lower than the skin concentration (i.e., take the blood level to be zero in the skin absorption equation). (b) Estimate how it takes after exposure begins for the groundskeeper's plasma dieldrin levels to reach 1 ng/L. (c) Estimate the maximum plasma dieldrin concentration in ng/L that will occur in this groundskeeper due to this exposure. (d) Estimate how long it will take after exposure ends for the groundskeeper's plasma dieldrin levels to drop back down to 1 ng/L. %3D
02A: 2.1-2.5 and Accuracy Handout (70 min) ulate Figures of Merit for Trueness ▾ Part A. Absolute Error A breathalyzer is a portable electrochemical instrument that measures the concentration of ethyl alcohol in a sample of exhaled breath A forensic chemist checks the calibration of a breathalyzer by testing a standard air sample known to contain 0.174 mg/L of ethanol seven times. The average value of these seven replicate measurements is found to be 0 157 mg/1 Calculate the absolute error of the breathalyzer. 1971 ΑΣΦΑ Submit Previous Answers Request Answer ? Previous x Incorrect; Try Again: 4 attempts remaining Q Search mgl ly Colle 16 of 17 E dx Next 11:44 PM 1/31/202 BANG &
please help me find average and standard deviation
Answer #4
Help 2
Plot a professional quality standard curve (absorbance vs. protein amount in µg) with an appropriate title and caption underneath the plot from the data give above. The caption should include the best-fit data.
Standardization of 0.10 M HCl1. Take three (3) clean and properly labeled 250-mL Erlenmeyer flasks. Into the three flasks, weigh 0.1 g of the primary standard Na2CO3 to the nearest 0.1 mg. Record the weights of the primary standard.2. Add about 75.0 mL of boiled distilled water and swirl to dissolve the solids.3. Add 2 to 3 drops of phenolphthalein indicator. Record the initial burette reading and titrate with the prepared 0.10 M HCl solution until phenolphthalein endpoint.4. Record the final burette reading for each titration in your data sheetDetermination of Ksp and Molar Solubility1. Add Ca(OH)2 to 250.0 mL distilled water with stirring until equilibrium is achieved. 2. Filter the undissolved precipitate. Measure out 50.0 mL of the supernate into a 250-mL Erlenmeyer flask using a pipette.3. Add a few drops of phenolphthalein indicator and titrate with standardized HCl solution until endpoint is achieved.4. Record the volume the HCl solution used. Perform two more trials.…
Cat Noir was tasked to determine the concentration of a CuSO4 unknown solution. She prepared 5 different standards of CuSO4 using the table below as her guide. She ran the standards and the unknown solution in the UV-VIS Spectrophometer, and recorded the absorbances of each solution. Show linear equation derived from calibration curve and solution to concentration of the unknown solution below. Encircle final answer. Cuvette Volume 0.5000 M CuSO4 Volume distilled H2O Absorbance 1 1.000 mL 4.000 mL 0.607 2 2.000 mL 3.000 mL 0.655 3 3.000 mL 2.000 mL 0.709 4 4.000 mL 1.000 mL 0.797 5 5.000 mL 0.000 mL 0.832 Blank 0.000 mL 5.000 mL 0.000 Unknown solution 0.684
The ______________ is the physical method of separation illustrated in this process: About three milliliters of aqueous iodine solution is mixed with one milliliter of chloroform in a test tube. The solution is shaken very well and a formation of two layers is observed. * Filtration Extraction Distillation Adsorption