gtytyy

[Nisus]

Titrahon results-



expt 1

initial bunette reading = 2.0 cm3

final “ “ = 30.6 cm3

volume of acid used = 27.4cm3



expt 2

initial bunette reading = 0.5 cm3

final “ “ = 28.5 cm3

volumeof acid used = 28.00 cm3



expt 3

25cm3 of ammonium, no idicater used

Volume of acid added = 27.9cm3



Calculation –

Equation for the reaction is

H2so4 + 2nh3 à (nh4)2so4



Theoretical yield-

Relahave atomic masses

H=1

S=32

O=16

N=14



Molecular mass of sulphuric acid h2so4

= (2x1) + 32 + (4x16)

= 2 + 32 + 64

= 98g



Molecular mass of ammonia nh3

= 14 + (3x1)

= 17g



Molecular mass of ammonium sulphate (nh4)2 so4

= (2x14) + (8x1) + 32 + (4x16)

= 28 + 8 + 32 + 64

= 132g



Amount of sulphuric acid used

- 98g of h2so4 in 1000cm3 of water as it is 1 molar strength

- But u will use a smaller volume vcm3 in the titration

- So the actual mass of h2so4 will be less than 98g, let this be m grams



So the amount theoretically used is:

M=98xv

1000





=98x27.9

1000



The theoretical yield is 2.73g



Percentage yield –

Percentage yield = actual yield x 100 = %

Theoretical yield

= 1.451 x 100

3.68

= 38.3 %