1 mol Ca2+1 mol EDTAmol Ca2+mol EDTA1= L EDTA xL0.010 L water33 Using the following equation, determine the average water hardness of your water. Record the hardness (ppm) in Data Table2.Note: PPM is equivalent to mg/L for dilute solutions.1 mol CACO31 mol Ca2+100.06 g CaCO31 mol CaCO3mol Ca2+1000 mgPpm CaCO, =1L1g囲DataExperiment 1E Data Table 1E Data Table 2Exercise 1Data Table 2: Water HardnessAverage Volume of EDTA Used (mL)Concentration Ca2+ lons Per Liter of Water (mol/L)Water Hardness (ppm CaCO3).23

Given the average volume of EDTA used = 0.23 mL * 1 L1000 L= 2.3*10-4 L

Answered: mol Ca?+ L 1 mol Ca+ 1 mol EDTA mol…

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter7: Solutions And Colloids

Section: Chapter Questions

Problem 7.29E

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Table sugar (C12H22O11) or urea [(NH2)2CO] can be used by road crews to melt ice on roads, but solutions of CaCl2 are generally used instead. Assuming equal costs per pound of substance, why is CaCl2 used instead of table sugar or urea?
A sample of water contains 0.010 ppm lead ions, Pb2+. (a) Calculate the mass of lead ions per liter in this solution.(Assume the density of the water solution is 1.0 g/mL.) (b) Calculate the mass fraction of lead in ppb.
Assume that a water sample tested has 150 mg/L total hardness. The Mg hardness is 50 mg/L,Ca hardness is 100 mg/L, and bicarbonate alkalinity is 30 mg/L (all concentrations are mg/L as CaCO3). Calculate how much lime and soda ash you would need to add to get the hardness below 50 mg/L.
Chemistry Question
A water contains 180 mg/l Ca, 75 mg/I Mg, 160 mg/l HCO3', and 150 mg/l CO2, all expressed as CaCO3. Assume that water is to be softened to a final Ca-hardness of 60 mg/l as CaCO3, and a final Mg- hardness of 30 mg/l as CaCO3. Also, assume that the excess lime equals 1 meq/l. MW Ca 40 Mg 24 HCO3 61 CO2 44 CaCO3 100 Calculate the required amount of lime (in mg/l): Calculate the required amount of lime (in mg/l):
The amount of water which should be added to 0.700 M NaOH solution to make 100 mL 0.250 M solution is 19 Multiple Cholce 00:5213 79.6 mL 35.7 mL 55.2 mL 64.3 mL 30.5 mL Mc Graw Hill Type here to search 立
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50 mL of stock solution were taken and added to flask. Then 50 mL of Di water were added to the flask. This is solution 1. Then 50mL of solution 1 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 2. Then 50mL of solution 2 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 3. Then 50mL of solution 3 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 4. Find the concetrations of each solution. Information of stock solution - molar mass- 534.3g/mole 0.587g in MilliQ
Name: Date: Section: Prelaboratory Assignment: Determination of the Hardness of Water 1. A 0.512 g sample of CaCO, is dissolved in 12 M HCl and the mixture is diluted to 250 mL. a) How many moles of CaCO, are used? moles b) What is the [Ca²*] in the 250 mL solution? b) How many moles of Ca²* are in a 25 mL sample of the 250 mL solution? moles
Part III: Determination of Saturated Solutions Molarity (saturated) Tube # Temperature (°C) Molarity (dilute) Absorbance 2 0.6 0.157 20.1 0.291 4 37.6 0.351 50.1 0.500 6. 70.9 0.714 show calculation for Tube #2, Molarity (dilute) (use graph equation): show calculation for Tube #2, Molarity (saturated): 1. Is the relationship between solubility and temperature direct or inverse? Explain.
Materials Needed solid I2 solid CUSO4-5H20 food dye solid (NH4)2SO4 heavy metals waste container halogenated waste container non-halogenated waste container semi-micro test tubes and rack regular test tubes and rack squash pipettes acetone cyclohexane propan-2-ol Method Part A: Solubility of ionic and molecular solids 1. Place a small amount (about the size of 1 grain of rice, see picture) of copper sulfate into each of three DRY semi-micro test tubes. Add 20 drops of water to the first test tube and gently flick the test tube with your finger to ensure mixing. 2. Repeat step 1 using acetone in place of water as the solvent in the second test tube. 3. Repeat step 2 replacing acetone with cyclohexane in the third test tube. Hold the test tubes against a white background to compare the solubility of copper sulfate in the three solvents and record your results. Discard these mixtures into the heavy metals waste container in the fume cupboard. Once these test tubes have been emptied you…
help find dilution of concentration using data on tables

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