Home
Class 11
CHEMISTRY
0.4 gm of an organic compound was treate...

0.4 gm of an organic compound was treated according to Kjeldahl's method. The ammonia evolved was absorbed in 50 ml of `0.5 MH_3PO_3`. The residual acid required 30 ml of 0.5 M `Ca(OH)_2` Find the percentage of `N_2` in the compound. (answer is divided by 10)

Text Solution

Verified by Experts

The correct Answer is:
7
Here `H_3 PO_3 ` is diabasic (ie ,n = 2)
The normality of `H_3PO_3 = M xx n = 0.5 xx2 =1N`
mEq. Of `H_3PO_3 = 50xx0.5 xx2 =50`
mEq. Of `Ca(OH)_2 =30 xx0.5 xx2=30`
Excess of acid used to neutralise `NH_3 = 50 -30=20 `
Percentage of `N_2 = (1.4 xx "mEq.of acid used to neutralise" NH_3)/("Weight of compound ") = (1.4 xx20)/(0.4) =70%`
Promotional Banner

Topper's Solved these Questions

  • PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS

    BRILLIANT PUBLICATION|Exercise LEVEL- III (Matching Column Type)|5 Videos

  • PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS

    BRILLIANT PUBLICATION|Exercise LEVEL- III (Statement Type)|6 Videos

  • PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS

    BRILLIANT PUBLICATION|Exercise LEVEL- III (Multiple Correct Answer Type)|9 Videos

  • p-BLOCK ELEMENTS

    BRILLIANT PUBLICATION|Exercise LEVEL- III (Linked Comprehension Type) (Paragraph IV )|3 Videos

  • REDOX REACTIONS

    BRILLIANT PUBLICATION|Exercise LEVEL -III|50 Videos

Similar Questions

Explore conceptually related problems

A sample of 0.50 g of an organic compound was treated according to Kjeldahl's method. Ammonia evolved was absorbed in 50 mL of 0.5 M H_2SO_4 . The residual acid required 60 mL or 0.5 M NaOH solution for neutralisation. Find the percentage composition of nitrogen in the compound.

1g of an organic compound was Kjeldahlised and the NH_3 evolved was absorbed in 50 ml 0.5 M H_(2) SO_(4) . The residual acid required 60 ml (M)/(2) NaOH . Percentage of nitrogen in the compound is

During nitrogen estimation of an organic compound by Kjeldahls method, the amimo- nia evolved by 0.5 g of the compound neutralised 10 mL of 1 M H_2 SO_4 . Calculate the percentage of nitrogen in the compound.

Magnesium reduced NO_(3) according to the equation given below: NO_(3)^(-) + Mg + 3H_(2)O rarr Mg(OH)_(2)+ OH + NH_(3) In basic medium, 25 ml sample of NO_(2) was reacted with Mg. The ammonia gas evolved was passed through 50 ml of 1.15 N HCI. The excess HCI required 32.1 ml of 0.1 M NaOH for neutralization. The molarity of NO_(3) in the original sample is