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0.4g of a polybasic acid HnA (all the hydrogens are acidic) requires 0.5g of NaOH for complete neutralization. The number of replaceable hydrogen atoms in the acid and the molecular weight of 'A' would be : (Molecular weight of the acid is 96 gms.)
  • a)
    1, 95                      
  • b)
    2, 94                       
  • c)
    3, 93                                 
  • d)
    4,92
Correct answer is option 'C'. Can you explain this answer?
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0.4g of a polybasic acid HnA (all the hydrogens are acidic) requires 0...
Given, 0.4g of polybasic acid HnA requires 0.5g of NaOH for complete neutralization. The molecular weight of the acid is 96 gms.

To find the number of replaceable hydrogen atoms in the acid and molecular weight of A, we need to use the concept of equivalent weight.

1. Equivalent weight of NaOH
As NaOH is a monobasic strong base, its equivalent weight is equal to its molecular weight. Therefore, the equivalent weight of NaOH = 40 g/mol.

2. Equivalent weight of HnA
From the given data, 0.4g of HnA requires 0.5g of NaOH for complete neutralization. This implies that 1g of HnA requires 1.25g of NaOH for complete neutralization.

Let's assume the equivalent weight of HnA is x. Then we can write the following equation for the neutralization reaction:

x/1 + 40/1 = 96/1

Solving this equation, we get x = 93.75 g/mol.

Therefore, the equivalent weight of HnA is 93.75 g/mol.

3. Number of replaceable hydrogen atoms in HnA
As HnA is a polybasic acid, we can find the number of replaceable hydrogen atoms by dividing the molecular weight of HnA by its equivalent weight.

Number of replaceable hydrogen atoms = molecular weight of HnA / equivalent weight of HnA

Number of replaceable hydrogen atoms = 96/93.75 = 1.022

As the number of replaceable hydrogen atoms in HnA should be a whole number, we can round off the answer to the nearest integer.

Therefore, the number of replaceable hydrogen atoms in HnA is 3.

Hence, the correct option is (c) 3, 93.
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0.4g of a polybasic acid HnA (all the hydrogens are acidic) requires 0.5g of NaOH for complete neutralization. The number of replaceable hydrogen atoms in the acid and the molecular weight of 'A' would be : (Molecular weight of the acid is 96 gms.)a)1, 95b)2, 94c)3, 93d)4,92Correct answer is option 'C'. Can you explain this answer?
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