Chemistry UNIT 6B question summer 2002 Watch

Mani
Badges: 0
#1
Report Thread starter 11 years ago
#1
hello i am having difficulty with this question can someone please help me.

1. A fertiliser is known to contain ammonium sulphate, (NH4)2SO4, as the only ammonium salt.
This question concerns methods for the determination of the ammonium and sulphate ions.
(a) A sample weighing 3.80 g was dissolved in water and the volume made to 250 cm3. To
25.0 cm3 portions of this solution about 5 cm3 (an excess) of aqueous methanal was
added. The following reaction took place:
4NH4+ (aq) + 6HCHO(aq)-----> C6H12N4(aq) + 4H+(aq) + 6H2O(l)
The liberated acid was titrated directly with 0.100 mol dm–3 aqueous sodium hydroxide.
The average volume required was 28.0 cm3. Calculate the percentage of ammonium
sulphate in the fertiliser.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 19 Oct '19
  • Coventry University
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19
  • University of Birmingham
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19

Why wouldn't you turn to teachers if you were being bullied?

They might tell my parents (11)
6.04%
They might tell the bully (18)
9.89%
I don't think they'd understand (32)
17.58%
It might lead to more bullying (69)
37.91%
There's nothing they could do (52)
28.57%

Watched Threads

View All