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A monobasic acid has 68.9carbon and 4.8%hydrogen 0.122 gm of acid required 10ml of N/10 caustic soda solution for neutralization what is molecular formulae of the compound?
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A monobasic acid has 68.9carbon and 4.8%hydrogen 0.122 gm of acid requ...
Calculating Molecular Formula of Monobasic Acid

Given:

  • Carbon(C) = 68.9%

  • Hydrogen(H) = 4.8%

  • Weight of the acid = 0.122g

  • Volume of N/10 caustic soda solution required for neutralization = 10ml



Step 1: Calculate the Number of Moles of Caustic Soda

  • 1 N solution contains 40g of NaOH per liter of solution

  • 1/10 N solution contains 4g of NaOH per liter of solution

  • 10ml of N/10 solution contains 0.04g of NaOH

  • Number of moles of NaOH = Weight of NaOH / Molar mass of NaOH

  • Molar mass of NaOH = 40g/mol

  • Number of moles of NaOH = 0.04g / 40g/mol = 0.001 mol



Step 2: Calculate the Number of Moles of Monobasic Acid

  • From the neutralization reaction: NaOH + HX → NaX + H2O

  • 1 mole of NaOH reacts with 1 mole of HX

  • Number of moles of HX = Number of moles of NaOH

  • Number of moles of HX = 0.001 mol



Step 3: Calculate the Molecular Weight of Monobasic Acid

  • Molecular weight of monobasic acid = Weight of the acid / Number of moles of acid

  • Number of moles of acid = Weight of carbon / Atomic weight of carbon + Weight of hydrogen / Atomic weight of hydrogen

  • Atomic weight of carbon = 12g/mol

  • Atomic weight of hydrogen = 1g/mol

  • Weight of carbon = 0.689 x 0.122g = 0.084 g

  • Weight of hydrogen = 0.048 x 0.122g = 0.006 g

  • Number of moles of acid = 0.084g / 12g/mol + 0.006g / 1g/mol = 0.007 mol

  • Molecular weight of monobasic acid = 0.122g / 0.007 mol = 17.43g/mol



Step 4: Calculate the Molecular Formula of Monobasic Acid

  • Molecular formula of monobasic acid = Empirical formula of acid x n

  • Empirical formula of acid = CH2O

  • Molecular weight of empirical formula = 12g/mol + 2g/mol + 16g/mol =
Community Answer
A monobasic acid has 68.9carbon and 4.8%hydrogen 0.122 gm of acid requ...
The answer is C7H6O2. Benzoic acid.
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Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. Which one of the following is the correct molecular structure of water molecule?

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A monobasic acid has 68.9carbon and 4.8%hydrogen 0.122 gm of acid required 10ml of N/10 caustic soda solution for neutralization what is molecular formulae of the compound?
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