Problem 2. A sample of groundwater is subjected to hardness and alkalinity-acid measurements. The hardness of the sample is measured using EDTA (0.02 N) titration, wh alkalinity and acidity of the sample are determined using acid (0.02 N H₂SO4) and base (0.02 NaOH) solutions. The titrant consumptions for hardness and alkalinity-acidity measurements the sample are summarized in the following table. Sample volume Titrant consumptions (ml) (ml) 50 ml 50 ml 50 ml 50 ml 1 ml of H₂SO4 solution 6 ml of H₂SO4 solution 0.5 ml of NaOH solution 10 ml of EDTA solution Titration end- point (pH or color) pH = 8.3 pH = 4.3 pH = 8.3 Red to blue Use all information given in the text and table, calculate: a) The hardness of groundwater sample as mg/L CaCO3. b) Phenolphthalein acidity of sample as mg/L CaCO3. c) Methyl orange alkalinity of sample as mg/L CaCO³. d) Phenolphthalein alkalinity of sample as mg/L CaCO3. Please note that the hardness of water is assumed to be due to only calcium and magnesium ion while the alkalinity and acidity are only due to carbonate species (H₂CO3, HCO3 and CO3²). Molecular weights (g/mole): Ca = 40, C = 12,0 = 16

Problem 2. A sample of groundwater is subjected to hardness and alkalinity-acid measurements. The hardness of the sample is measured using EDTA (0.02 N) titration, wh alkalinity and acidity of the sample are determined using acid (0.02 N H₂SO4) and base (0.02 NaOH) solutions. The titrant consumptions for hardness and alkalinity-acidity measurements the sample are summarized in the following table. Sample volume Titrant consumptions (ml) (ml) 50 ml 50 ml 50 ml 50 ml 1 ml of H₂SO4 solution 6 ml of H₂SO4 solution 0.5 ml of NaOH solution 10 ml of EDTA solution Titration end- point (pH or color) pH = 8.3 pH = 4.3 pH = 8.3 Red to blue Use all information given in the text and table, calculate: a) The hardness of groundwater sample as mg/L CaCO3. b) Phenolphthalein acidity of sample as mg/L CaCO3. c) Methyl orange alkalinity of sample as mg/L CaCO³. d) Phenolphthalein alkalinity of sample as mg/L CaCO3. Please note that the hardness of water is assumed to be due to only calcium and magnesium ion while the alkalinity and acidity are only due to carbonate species (H₂CO3, HCO3 and CO3²). Molecular weights (g/mole): Ca = 40, C = 12,0 = 16

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...

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Question

Problem 2. A sample of groundwater is subjected to hardness and alkalinity-acidity
measurements. The hardness of the sample is measured using EDTA (0.02 N) titration, while
alkalinity and acidity of the sample are determined using acid (0.02 N H₂SO4) and base (0.02 M
NaOH) solutions. The titrant consumptions for hardness and alkalinity-acidity measurements for
the sample are summarized in the following table.
Sample volume Titrant consumptions
(ml)
(ml)
50 ml
50 ml
50 ml
50 ml
1 ml of H₂SO4 solution
6 ml of H₂SO4 solution
0.5 ml of NaOH solution
10 ml of EDTA solution
Titration end-
point (pH or
color)
pH = 8.3
pH = 4.3
pH = 8.3
Red to blue
Use all information given in the text and table, calculate:
a) The hardness of groundwater sample as mg/L CaCO3.
b) Phenolphthalein acidity of sample as mg/L CaCO3.
c) Methyl orange alkalinity of sample as mg/L CaCO3.
d) Phenolphthalein alkalinity of sample as mg/L CaCO3.
Please note that the hardness of water is assumed to be due to only calcium and magnesium ions,
while the alkalinity and acidity are only due to carbonate species (H₂CO3, HCO3 and CO3²-).
Molecular weights (g/mole): Ca = 40, C = 12, 0 = 16

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