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How many gm. of dibasic acid (Mol.wt. = 200) should be present in 100ml. of its aqueous solution to give decinormal strength?
- a)1gm
- b)2gm
- c)10gm
- d)20gm
Correct answer is option 'A'. Can you explain this answer?
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How many gm. of dibasic acid (Mol.wt. = 200) should be present in 100m...
The correct option is A] 1 gm
Molarity of dibasic acid
dibasic acid
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How many gm. of dibasic acid (Mol.wt. = 200) should be present in 100m...
To determine the amount of dibasic acid needed to prepare a decinormal solution, we need to first understand the concept of normality.
1. Understanding Normality:
Normality (N) is a measure of the concentration of a solute in a solution. It is defined as the number of gram equivalents of the solute present per liter of the solution.
The gram equivalent weight (GEW) of a substance is the molecular weight divided by the number of equivalents. In the case of a dibasic acid, it is the molecular weight divided by 2 since it can donate two protons.
2. Calculation of Normality:
To calculate the normality of a solution, we need to know the volume of the solution and the number of equivalents of the solute present.
Given:
Volume of solution = 100 ml = 0.1 L
Normality (N) = 0.1 N (since it is a decinormal solution)
3. Calculation of Gram Equivalent Weight (GEW):
The molecular weight of the dibasic acid is given as 200 g/mol. Since it is a dibasic acid, the GEW will be half of the molecular weight, i.e., 200/2 = 100 g/mol.
4. Calculation of Amount of Dibasic Acid:
To calculate the amount of dibasic acid (in grams), we can use the formula:
Amount (in grams) = Normality (N) * Volume (in liters) * GEW
Substituting the given values:
Amount = 0.1 N * 0.1 L * 100 g/mol
= 1 gm
Therefore, the correct answer is option A) 1 gm.
1. Understanding Normality:
Normality (N) is a measure of the concentration of a solute in a solution. It is defined as the number of gram equivalents of the solute present per liter of the solution.
The gram equivalent weight (GEW) of a substance is the molecular weight divided by the number of equivalents. In the case of a dibasic acid, it is the molecular weight divided by 2 since it can donate two protons.
2. Calculation of Normality:
To calculate the normality of a solution, we need to know the volume of the solution and the number of equivalents of the solute present.
Given:
Volume of solution = 100 ml = 0.1 L
Normality (N) = 0.1 N (since it is a decinormal solution)
3. Calculation of Gram Equivalent Weight (GEW):
The molecular weight of the dibasic acid is given as 200 g/mol. Since it is a dibasic acid, the GEW will be half of the molecular weight, i.e., 200/2 = 100 g/mol.
4. Calculation of Amount of Dibasic Acid:
To calculate the amount of dibasic acid (in grams), we can use the formula:
Amount (in grams) = Normality (N) * Volume (in liters) * GEW
Substituting the given values:
Amount = 0.1 N * 0.1 L * 100 g/mol
= 1 gm
Therefore, the correct answer is option A) 1 gm.
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How many gm. of dibasic acid (Mol.wt. = 200) should be present in 100ml. of its aqueous solution to give decinormal strength?a)1gmb)2gmc)10gmd)20gmCorrect answer is option 'A'. Can you explain this answer?
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