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- Complete the Titrimetric Data table.Average [EDTA] = C: Determination of the hardness of an unknown water sample: Using an unknown water sample, three 25 mL samples in 3 separate 250 mL Erlenmeyer flasks are prepared. To each flask, 5 mL of pH pH10 buffer, 3 to 5 drops of Eriochrome Black T indicator, and 15 drops of 0.03 M MgCl2 solution are added. Each flask is titrated to the end point using EDTA.6.00 mL of 0.0100 M EDTA is mixed with 5.00 mL of 0.0100 M Ca2+. The pH is adjusted to 10 and DI water is added to make the final volume 25.00 mL. What is the concentration of Ca2+ in this solution? [log Kf = 10.65, α = 0.30]
- A sample containing 0.200 g primary standard calcium carbonate (CaCO3, FW-100.09 g/mol) was dissolved in HCI and diluted to 50 mL solution. After addition of ammonia buffer and Eriochrome Black T, the prepared solution was titrated using EDTA which required 16.0 mL. Calculate the molarity of the EDTA solution. * Identify the general type of titrimetric method used. * Identify the indicator in the titration * Identify the endpoint colorSuppose that you want to titrate a sample of vinegar with standard sodium hydroxide solution to determine the concentration of acetic acid in it, and you want to use an indicator to help you determine the end-point. Which of the following indicator would be suitable? (A) Bromocresol Green (Ka ~ 2.0 x 10–5; color: yellow in acid; blue in base) (B) Methyl Red (Ka ~ 5.0 x 10–6; color: red in acid; yellow in base) (C) Bromothymol Blue (Ka ~ 6.0 x 10–8; color: yellow in acid; blue in base) (D) Any of themExplain why K2CrO4 is used as an indicator in Argentometric titration?
- 1) What is the reason 2) In order to determine the hardness of water, 100 mL sample is taken. After neutralizing the sample, pH 10 buffer solutions and Erichrom black-T indicator are added. This sample is titrated with 10.7 mL of the solution containing 3.7225 g EDTA in 1 L distilled water. Calculate the hardness of water in terms of considering the amount of CaCO3 present in the sample. (Mwt Ca:40 g/mole, O:16 g/mole, C:12 g/mole, EDTA: 372,25 g/mole)After solubilization, 150 mg of a silver sample is titrated with 25 mL of a solution containing 48.5 mg KCNS in 10 mL in the presence of Fe3+. Calculate the purity of Ag in the sample.A 0.1064-g of aldrin pesticide sample was decomposed and the liberated chloride was extracted using water. It was titrated with 23.28 mL of 0.03337 M AgNO 3 using a chromate indicator. Express results in % aldrin (C 12H 8Cl 6, MM=365). 63.21 % 22.12 % 17.28 % 44.42 %
- What are the common acid-base indicators for acidimetry-alkalimetry? Indicate the pH range and color change for each indicator.0.0322 M EDTA solution is used as the titrant in the titration of a 50.00 mL solution that is 0.0129 M in Cu2+. The solution is held at pH = 10.00 by a buffer that is 0.050 in ammonia (NH3). At what volume (in mL) of EDTA added will the equivalence point be reached?5. A 300.0 mg sample containing Na,CO3, NaHCO, and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 ml to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.