6. Water sample was titrated with EDTA after pH adjustment using Eriochrome black T indicator. Knowing that the concentration of EDTA is 0.050 M and density of water sample equals to 1.10 g/mL. (CaCO,= 100.09 amu).The following results was obtained trials volume of water sample (mL) volume of EDTA (mL) 250.0 250.0 250.0 250.0 10.05 7.00 10.50 10.10 Calculate he total hardness of water as CaCO, and accordingly classify this water. The following results was obtained 1Nm 4

6. Water sample was titrated with EDTA after pH adjustment using Eriochrome black T indicator. Knowing that the concentration of EDTA is 0.050 M and density of water sample equals to 1.10 g/mL. (CaCO,= 100.09 amu).The following results was obtained trials volume of water sample (mL) volume of EDTA (mL) 250.0 250.0 250.0 250.0 10.05 7.00 10.50 10.10 Calculate he total hardness of water as CaCO, and accordingly classify this water. The following results was obtained 1Nm 4

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter11: Dynamic Electrochemistry

Section: Chapter Questions

Problem 3P

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In order to adjust the EDTA solution, 10 mL of 0.01M Ca + 2 sample was taken and 10 mL of pH 10 buffer was added on it and it was completed to 100 mL. Then, two drops of EBT indicator were added and titrated with EDTA. Since the consumption is 13 mL, what is the concentration of EDTA solution in terms of molarity?
For complexometric titration of Ca (II) ions in the shell of an egg sample weighing 59,427 g, the necessary processes were applied to the egg shells and a sample of 100 mL was prepared. From the prepared sample, 1 mL was taken and diluted to 100 mL, the pH was adjusted, and two drops of EBT indicator were dripped on it. The prepared solution was titrated with 27.4 mL of EDTA solution set at 0.0097 M. Calculate the amount of calcium in the sample in CaCO3%. (Ca = 40g / mol, CaCO3= 100g / mol)
For the complexiometric titration of Ca2 + ions in the shell of the egg sample weighing 62,576 g, the necessary procedures were applied to the egg shells and 100 mL sample was prepared. 1 mL of the prepared sample was taken and diluted to 100 mL, the pH was adjusted, and two drops of EBT indicator were dropped on it. The prepared solution was titrated with 23.6 mL of 0.0095 M EDTA solution. What is the value of the amount of calcium in the sample in terms of% CaCO3? (Ca: 40, C: 12, O: 16 g / mol)
A solution containing Mg2+ was buffered to pH 9.81 and titrated with EDTA. Eriochrome black T, with p?a1 = 6.3 and p?a2 = 11.6 was used as the indicator. It is a diprotic acid, H2E What is the fraction of the predominant form of eriochrome black T in solution at this pH? (To answer this, report the alpha fraction of the indicator’s most prevalent species at this pH)
1) Calculate the total hardness for the first sample (Sample Volume,V : 50 mL,Volume of EDTA titrant used for the sample, A:9.6 mL) 2)Calculate the calcium and magnesium concentrations for the first sample in the video in meq/L and mg CaCO3/L.(Sample Volume= 50 mL, Magnesium hardness titrant volume = 0 mL, Calcium hardness titrant volume:2,6 mL) 3)Assuming the pH and alkalinity of the first sample in the video are 7.5 and 100 mg CaCO3/L, respectively, calculate the temporary and permanent hardness values for this sample 4How much CaCL2 in meq/L should be added to the sample to equalize calcium and magnesium hardness? Which hardness level (soft, medium, hard, very hard) does the sample belong to after this addition?
Calculate the pH during the titration of 50.00 mL of0.0500 M NaOH with 0.100 M HCl at 25oC after theaddition of the following volumes of reagent:a. 0.00 mLb. 10.00 mLc. 15.00 mLd. 20.00 mLe. 24.5 mLf. 25.00 mLg. 25.5 mLh. 27 mL
You have performed an iodimetric titration using a commercial vitamin C tablet. Based on the following information below, calculate the %(w/w) of vitamin C(MM=176.16 g/mol) in the tablet: Mass of tablet dissolved in 250.0 mL: 5.422 g Aliquot volume of sample titrated: 25.00 mL Concentration of KIO3: 0.023 M Final burrette volume: 41.31 mL Initial burrette volume: 8.89 mL Blank volume: 0.14 mL
A deep well sample of 100 mL was titrated with 0.010 M EDTA at pH=10 (with Mg-EDTA-pH 10 reagent) and consumed 30.15 mL using EBT indicator. Titration of another 100 mL of the same deep well sample with same titrant but the pH was adjusted to 12.10 and murrexide as indicator consumed 24.25 to reach end point. Calculate: a. Total hardness of water as CaCO3 b. ppm of Ca and Mg
In order to adjust the EDTA solution, 10 mL of 0.01M Ca + 2 sample was taken and 10 mL of pH 10 buffer was added on it and it was completed to 100 mL. Then, two drops of EBT indicator were added on it and titrated with EDTA. Since the consumption is 13 mL, which of the following is the concentration of the EDTA solution in terms of molarity? A. 0.0076B. 0.0101C. 0.0067D. 0.0111
A 0.4071-g sample of pure CaCO3 was transferred to a 500-mL volumetric flask, dissolved using a minimum of 6 M HCl, and diluted to volume. After transferring a 50.00-mL portion of this solution to a 250-mL Erlenmeyer flask, the pH was adjusted by adding 5 mL of a pH 10 buffer. After adding an indicator, the solution was titrated with the EDTA, requiring 42.63 mL to reach the end point. What is the concentration of EDTA? Choices: 0.0191 M, 0.0955 M, 0.00955 M, 0.477 M
Calculate the silver ion concentration in terms of pAg during the titration of 70.00 mL of 0.07000 M NaCl with 0.1000 M AgNO3 after the addition of the following volumes of reagent: (a) in the preequivalence point region at 20.00 mL, (b) at the equivalence point (25.00 mL), (c) after the equivalence point at 50.00 mL. For AgCl, Ksp = 1.82E10-10. Show your answer with three significant figures.
a 20 ml portion of a deep well water sample was diluted to 250 ml solution. a 50 ml aliquot of this diluted sample water was buffered at ph 10 and required 8. 50 ml of a standard EDTA.the titrant was standardized using 100ml containing 0.8622 mg primary standard calcium carbonate , which required 15.45 ml for titration.(a) identify a possible indicator and its endpoint color (b) calculate the molarity of the EDTA solution. (c) calculate the total hardness of the water as ppm CaCO3 (d) identify the quality of the water sample in terms of hardness