Data Note: Be consistent in reading volume measurements to reflect uncertainty i
ID: 575682 • Letter: D
Question
Data Note: Be consistent in reading volume measurements to reflect uncertainty in data. If you are estimating in the tenths place and you read the volume exactly at 10mL, then report 10.0mL Note: Watch the number of significant figures that you report in your final answer for water hardness! You are limited by the molarity of EDTA Also, remember to report the average water hardness! Trial Initial Volume of EDTA Final Volume of EDTA Concentration of Ca2 ions Volume of EDTA used (mL) Water Hardness ppm cacOs) Trial per liter of water (mol/L) 6.6 8.3 5.2 6.6 3.4 Average N/A N/A Analysis For trial 1, show your calculations in questions 1-3 that follow, including all Questions: work, before entering the data into the results table. Refer to the equation sheet on the last page on this document for guidance. Calculate the volume of EDTA used for each trial, and show all work here for one trial. Record values for each trial in the results table . 1. Based on the analysis of your local water, would you classify its hardness as soft, moderate, hard or very hard Explain your answer using your results 1. uations for anal Calculate the volume of EDTA used for each trial using the following equation. Record each value in the results table. 1. 2. Calculate the concentration of Ca2 ions per liter of water, showing all work for one trial only. Record each value in the results table. The molarity of EDTA is 0.01M. Recall that molarity = moles/L Initial volume of EDTA-Fnal vlume of EDTA volume of EDTA used 2. Calculate the concentration of Ca+2 ions per liter of water using the following equation. Record each value in the results table. The molarity of EDTA is 0.01M. Recall that molarity moles/L moles Ca2+ (molarity EDTA) × (mL EDTA) mL of water sample 3. Calculate the water hardness using your results from part 2, showing all work for one trial only. Record each value in the results table. 3. Calculate the water hardness using your results from part 2 and the following equation Record each value in the results table. moles Ca2+ × 1 m 01 CaCO, 100.06 g Caco, x 1000 1 LExplanation / Answer
By applying all equations obtained data summarized in given table.
volume of EDTA
used (mL)
Concentration of Ca+2 ions
per litter of water (mol/L)
Water hardness
(ppm CaCO3)
Basedon these data water sample is classified as soft, because 0-40 ppm CaCO3 containing water is soft water.
Trialvolume of EDTA
used (mL)
Concentration of Ca+2 ions
per litter of water (mol/L)
Water hardness
(ppm CaCO3)
1. 1.7 1.7*10-5 1.7 2. 1.4 1.4*10-5 1.4 3. 1.8 1.8*10-5 1.8 Average NA NARelated Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.