Flask123Flask123initial burettereading50 mL.38 mL28 mLvolume EDTArequired to chelate Ca²+final burettereading38 ml.28 mL20 mLtotal volumeVEDTAVuk...5........5................moles EDTAAverage moles of Ca2+/L-water =Average grams of Ca2+/L-water =1 mg/L = 1ppmAverage Hardness of water =moles Ca2+ presentin 25 mL water sample#7Volume EDTA requiredto chelate all Camoles Ca presentin IL water sample...molesgrams.....ppm 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 flasksare prepared. To each flask, 5 mL of pH pH10 buffer, 3 to 5 drops of Eriochrome Black Tindicator, and 15 drops of 0.03 M MgCl2 solution are added. Each flask is titrated to the end pointusing EDTA.

The explanation is given below-

Flask 1 2 3 Flask 1 2 3 initial burette reading 50 mL. 38 mL 28 mL volume EDTA required to chelate Ca²+ final burette reading 38 mL 28 mL 20 mL. total volume VEDTA Vuk ........ moles Ca* present in 25 mL water sample moles EDTA Average moles of Ca2+/L-water = Average grams of Ca2+/L-water = #7 Volume EDTA required to chelate all Ca moles Ca present in IL water sample ...moles ..grams

Flask 1 2 3 Flask 1 2 3 initial burette reading 50 mL. 38 mL 28 mL volume EDTA required to chelate Ca²+ final burette reading 38 mL 28 mL 20 mL. total volume VEDTA Vuk ........ moles Ca* present in 25 mL water sample moles EDTA Average moles of Ca2+/L-water = Average grams of Ca2+/L-water = #7 Volume EDTA required to chelate all Ca moles Ca present in IL water sample ...moles ..grams

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

3 thank you !
What should the concentration be for the acid? Calculate your percent error. Show work.
Spike recovery and detection limit. Species of arsenic found in drinking water include AsO32 3 (arsenite), AsO32 4 (arsenate), (CH3)2AsO2 2 (dimethylarsinate), and (CH3)AsO22 3 (methylarsonate). Pure water containing no arsenic was spiked with 0.40 mg arsenate/L. Seven replicate determinations gave 0.39, 0.40, 0.38, 0.41, 0.36, 0.35, and 0.39 mg/L.15 Find the mean percent recovery of the spike and the concentration detection limit (mg/L).
I need help please!!
Calculate initial concentrations added to the test tube. (Fe+3 and SCN-1) 5 mL of 0.002 M Fe(NO3)3, 2 mL of 0.002 M KSCN (mL) , and 3 mL of H2O. Is the initial concentration 0.002 M for both Fe+3 and SCN-1 or will the C1V1 = C2V2 equation need to be used? Fe and SCN are both the reactants of the reaction with FeSCN as the product being observed.
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
A 0.53 g sample containing KBr (MW=119) is dissolved in 50 mL of distilled water. Titrating with 0.04614 N AgNO3 requires 28.5 mL to reach the endpoint. Calculate the %w/w KBr in the sample. (Round-off your answer to 2-decimal places) Answer = ____%
please help me find average and standard deviation
Directions: (1) Determine the total volume of the standards by using a formula in the appropriate boxes (your instructor will help you with this). (2) Determine the concentration of Cu2+ in each standard, also using a formula in the appropriate cells. (3) Plot the absorbance as a function of Cu2+ concentration. Determine the equation for the best-fit line. 1.0 M ethylenediamine (mL) concentration Cu2+ absorbance (AU) at 550 nm 0.01 M CuSO4 5H2O H2O total volume stock Cu2+ standard (mL) (mL) (mL) (units) concentration (M) 1 0.50 0.00 9.50 0.025 0.01 2 0.50 0.50 9.00 0.031 0.01 3 0.50 1.00 8.50 0.048 0.01 4 0.50 2.00 7.50 0.153 0.01 5 0.50 3.00 6.50 0.223 0.01 0.50 4.00 5.50 0.307 0.01 7 0.50 5.00 4.50 0.384 0.01
< Report - Gramma NGLSync X OWLv2 | X Cengage + entActivity.do?locator-assignment-take 0 How many amperes are required to deposit 0.291 grams of magnesium metal in 213 seconds, from a solution that contains Mg²+ ions. 2+ A Submit Answer Retry Entire Group 9 more group attempts remaining a 68°F Et OFE 1:37 PM 5/27/2022
Determine the pKa using Henderson-Hasslebach equation. pH = 2.9 For serial dilution method: HCI H30 CI .1 -X +x +x .1-x X Ka = x/ 0.1 - x X = 1029 X= 0.00126 Hben = .1 - .00126 Hben = 0.99874 Ka = 0.00126 / 0.1 - 0.00126 Ka = 0.0000161
Q) water hardness of each trial and average ppm with calculation, please. Hard Water Trial 1 Hard Water Trial 2 Hard Water Trial 3 Initial Syringe Reading 1.0ml 1.0ml 1.0ml Final Syringe Reading 0.88ml 0.84ml 0.85ml Volume of EDTA Consumed 0.12ml 0.16ml 0.15ml Water Hardness ppm CaCO3 Average ppm