No1)
Volume of burette | Rough | Ist titre |
2nd titre
Final Reading(cm) | 26.00 | 22.40 |
32.24
Initial Reading(cm)| 0.00 | 0.00 | 0.00 Volume of A. (cm) |26.00 | 22.40 | 22.40
Average volume used= ( 22.40
22.40 )/2
(I) Conc, of A in mol/dm3= mass/molar
mass Mass of A is 3.89g/dm3
Molar mass of A(Hcl) = ( 1 35.5 ) =36.5
Therefore 38.9/36.5
=0.1066mol/dm3
(ii) Conc. Of B in mol/dm3= CaVa/CbVb =
Na/Nb = 0.1066 x 22.40/Cb x 25.00 = 1/1
Cb = 1 x 0.1066 x 22.40/25.00 x 1
Cb = 0.0955mol/dm3
Conc. Of B in g/dm3= molar conc of
B x molar mass of B
= 0.0955 x 40 = 3.82g/dm3
(Iii) Conc. Of B in g/dm3= molar conc of
B x molar mass of B
= 0.0955 x 40
= 3.82g/dm3
1c) It is often used in titrations because of its
clear and distinct colour change.
Because it
changes colour at the pH of a mid-
strength
acid, it is usually used in titrations for acids.
Unlike a universal indicator, methyl
orange
does not have a full spectrum of colour
change, but has a sharper end point. ......
.keep refreshing it.........
and we will keep posting
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