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100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer?
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100 ml of a given sample of water require 20 ml of N/10 HCl in the pre...
Calculation of Permanent Hardness of Water Sample
Given Data:
Volume of water sample = 100 ml
Volume of N/10 HCl required = 20 ml
Volume of N/10 Na2CO3 required = 50 ml
Permanent hardness of water with respect to CaCO3 = ?
Step 1: Calculation of Total Hardness
Total hardness of water is the sum of temporary and permanent hardness. As the water sample is titrated with HCl, temporary hardness is absent.
Total hardness = Permanent hardness
Step 2: Calculation of Number of Grams of CaCO3 in 1 ml of N/10 HCl
One mole of HCl reacts with one mole of CaCO3 to form one mole of CO2 and one mole of CaCl2.
HCl + CaCO3 → CaCl2 + CO2 + H2O
1 mole of HCl reacts with 1 mole of CaCO3 = 100 g of HCl reacts with 100 g of CaCO3.
1 mole of N/10 HCl = 0.1 mole of HCl
0.1 mole of HCl reacts with 0.1 mole of CaCO3 = 10 g of HCl reacts with 10 g of CaCO3
10 g of CaCO3 in 1000 ml of N/10 HCl = 0.01 g of CaCO3 in 1 ml of N/10 HCl
Step 3: Calculation of Number of Grams of CaCO3 in Water Sample
Volume of water sample = 100 ml
Volume of N/10 HCl required = 20 ml
Number of moles of HCl used = (20/1000) x (1/10) = 0.002 moles
Number of moles of CaCO3 = Number of moles of HCl used
Weight of CaCO3 = Number of moles of CaCO3 x Molar mass of CaCO3
Molar mass of CaCO3 = 40 + 12 + (3x16) = 100 g/mol
Weight of CaCO3 = 0.002 x 100 = 0.2 g
Step 4: Calculation of Permanent Hardness in terms of ppm
Permanent hardness of water sample with respect to CaCO3 = (Weight of CaCO3 in water sample / Volume of water sample) x 106
Permanent hardness of water sample with respect to CaCO3 = (0.2/100) x 106 = 2000 ppm
As the water sample is titrated with Na2CO3 for complete precipitation, the calculated hardness is temporary hardness. Thus, the permanent hardness is calculated to be:
Permanent hardness of water sample with respect to CaCO3 = Total hardness - Temporary hardness
Permanent hardness of water sample with respect to CaCO3 = 2000 - 500
Permanent hardness of water sample with respect to CaCO3 = 1500 ppm
Therefore, the permanent hardness of water sample with respect to CaCO3 is calculated to be 1500 ppm.
Given Data:
Volume of water sample = 100 ml
Volume of N/10 HCl required = 20 ml
Volume of N/10 Na2CO3 required = 50 ml
Permanent hardness of water with respect to CaCO3 = ?
Step 1: Calculation of Total Hardness
Total hardness of water is the sum of temporary and permanent hardness. As the water sample is titrated with HCl, temporary hardness is absent.
Total hardness = Permanent hardness
Step 2: Calculation of Number of Grams of CaCO3 in 1 ml of N/10 HCl
One mole of HCl reacts with one mole of CaCO3 to form one mole of CO2 and one mole of CaCl2.
HCl + CaCO3 → CaCl2 + CO2 + H2O
1 mole of HCl reacts with 1 mole of CaCO3 = 100 g of HCl reacts with 100 g of CaCO3.
1 mole of N/10 HCl = 0.1 mole of HCl
0.1 mole of HCl reacts with 0.1 mole of CaCO3 = 10 g of HCl reacts with 10 g of CaCO3
10 g of CaCO3 in 1000 ml of N/10 HCl = 0.01 g of CaCO3 in 1 ml of N/10 HCl
Step 3: Calculation of Number of Grams of CaCO3 in Water Sample
Volume of water sample = 100 ml
Volume of N/10 HCl required = 20 ml
Number of moles of HCl used = (20/1000) x (1/10) = 0.002 moles
Number of moles of CaCO3 = Number of moles of HCl used
Weight of CaCO3 = Number of moles of CaCO3 x Molar mass of CaCO3
Molar mass of CaCO3 = 40 + 12 + (3x16) = 100 g/mol
Weight of CaCO3 = 0.002 x 100 = 0.2 g
Step 4: Calculation of Permanent Hardness in terms of ppm
Permanent hardness of water sample with respect to CaCO3 = (Weight of CaCO3 in water sample / Volume of water sample) x 106
Permanent hardness of water sample with respect to CaCO3 = (0.2/100) x 106 = 2000 ppm
As the water sample is titrated with Na2CO3 for complete precipitation, the calculated hardness is temporary hardness. Thus, the permanent hardness is calculated to be:
Permanent hardness of water sample with respect to CaCO3 = Total hardness - Temporary hardness
Permanent hardness of water sample with respect to CaCO3 = 2000 - 500
Permanent hardness of water sample with respect to CaCO3 = 1500 ppm
Therefore, the permanent hardness of water sample with respect to CaCO3 is calculated to be 1500 ppm.
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100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer?
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100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about 100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer?.
100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about 100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer?.
Solutions for 100 ml of a given sample of water require 20 ml of N/10 HCl in the presence of a methyl orange indicator.100 ml of the same water sample on separate titration with 50 ml of N/10 Na2CO3 for complete precipitation. What is the permanent hardness of water sample with respect to CaCO3? The answer is 1500 ppm.Can anyone please answer? in English & in Hindi are available as part of our courses for NEET.
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