II. Determination of Total Hardness of Water Source of water sample: Volume of water sample 22.00 mL Final volume reading (EDTA solution) Initial volume reading (EDTA solution) Volume consumed (EDTA solution) Molarity of standard EDTA solution used 34.60 mL 20.54 mL 14.06 mL 0.25 M Total hardness of water (ppm CaCO3)

II. Determination of Total Hardness of Water Source of water sample: Volume of water sample 22.00 mL Final volume reading (EDTA solution) Initial volume reading (EDTA solution) Volume consumed (EDTA solution) Molarity of standard EDTA solution used 34.60 mL 20.54 mL 14.06 mL 0.25 M Total hardness of water (ppm CaCO3)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter17: Complexation And Precipitation Reactions And Titrations

Section: Chapter Questions

Problem 17.42QAP

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Determine the total hardness of water (ppm CaCO3; MM: 100.09 g/mole) if 100.0mL sample of drinking water required 38.41mL of 4.65 x 10-3 M EDTA for titration. 179 ppm CaCO3 357 ppm CaCO3 452 ppm CaCO3 733 ppm CaCO3
5.00 mL of stock solution is diluted to 25.00 mL, producing solution ALPHA. 10.00 mL of solution ALPHA is diluted to 25.00 mL, resulting in solution BETA. 10.00 mL of solution BETA is then diluted to 25.00 mL, producing solution GAMMA. dilution factor for ALPHA from stock solution = 0.167 dilution factor for BETA from ALPHA solution = 0.0476 part c and d?
Detailed calculations on how to prepare the solutions listed below Solution: 50 mL 1 M oxalic acid Oxalic acid Mw = 90.03 g mol-1 Oxalic acid purity = 98% Solution: 10 mL 3 M sulfuric acid Sulfuric acid Mw = 98.079 g mol-1 Sulfuric acid density = 1.84 g mL-1 Sulfuric acid purity = 98% Solution: 10 mL saturated potassium oxalate potassium oxalate (monohydrate used) Mw = 184.23 g mol-1 Solubility of potassium oxalate in water at 25°C = 360 mg mL-1 Solution :20 mL 3% hydrogen peroxide Hydrogen peroxide is commercially available as a 32% solution.
Use the follow data below and answer the following questions: Component Concentration (mg/L) CO2 8 Ca2+ 45 Mg2+ 13 Sr2+ 12 Alkalinity 270 Determine the quantity (mass flow) of CaO and Soda Ash using practical solubility limit required to treat hard water taking volumetric flow as 145000 L/d and pH of 7.5 and purity of both reagents as 97%.
A community in a mountainous area of Bohol uses water collected from a nearby natural spring. A sample was submitted to a laboratory for the analysis of its total hardness. Describe the preparation of the following reagents: 100 mL of 1.0M stock EDTA solution. 0 L of 0.010 M EDTA solution from the stock EDT solution. 0 mL of 500.0 ppm of CaCO3 solution from a primary standard (assume solvent is distilled water only).
Method used was Volhard Method Sample preparation: 5ml sample diluted in 100 ml. 20ml aliquot was used for analysis. Concentration of AgNO3: 0.0609M Calculate mass of NaCl and % NaCl (w/v)
0.15 gm of calcium carbonate is dissolved in 1 liter of distilled water. 20 ml of this standard hard water requires 25 ml of EDTA solution. 100 ml of unknown hard water requires 18 ml of EDTA solution. The same water sample after boiling requires 12 ml of EDTA solution. Calculate Temporary hardness of water sample in ppm.
Accurately weigh out about 6g copper(ii) sulfate crystals into a weighing boat. Use the copper(ii) sulfate crystals to make up 250cm3 of standardized copper (ii) sulfate solution Pipette 25cm3 of this solution into a conical flask Add 1.5g potassium iodide and swirl thoroughly Titrate this solution with standard 0.1 moldm-3 Na2S2O3 in a burette. When the iodine color fades, add 1 cm3 starch indicator. Use your titration data below to calculate the percentage by mass of copper in the copper(ii) sulfate crystals.
0.75 gm of calcium carbonate is dissolved in 1 liter of distilled water. 100 ml of this standard hard water requires 25 ml of EDTA solution. 100 ml of unknown hard water requires 15 ml of EDTA solution. 100 ml of same water sample after boiling requires 10 ml of EDTA solution. Calculate Total, Permanent and Temporary hardness of water sample.
An sample of eggshell that weighs 1.0014g and is 51μm thick is titrated with disodium EDTA. A solution of the 1.0014g sample and 30 mL of HCl is vacuum filtered after being mixed. The product of the filtration is added to a 250mL volumetric flask and is diluted by being filled to the 250 mL mark with deionized water. 10 mL of this diluted mixture is mixed with EBT indicator and titrated with 0.05 M disodium EDTA. It takes 12.3 mL of disodium EDTA to notice a change in color. What percent mass of calcium is in the eggshell?
50mL of standard hard water (contains 10g of CaCO3 per liter) required 27mL of EDTA solution for end point. 100 mL of sample water required 12 mL of EDTA solution while 100mL of water after boiling required 7mL of EDTA solution. Calculate total, permanent and temporary hardness of water.
A 0.1093-g sample of impure Na2CO3( Molecular weight 106) was analyzed by the Volhard method. After adding 50.00 mL of 0.06911 M AGN03 (Molecular weight 169.87), the sample was back titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the end point. Report the purity of the Na2CO3 sample.