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(1a)
Tabulate:
Titrations |Rough|1st |2nd |3rd |
Final burette reading |18.00|
15.60|17.40|20.50|
Initial burette reading |0.00 |
0.00 |2.00 |5.00 |
volume of Acide used |18.00|
15.60|15.40|15.50|
(1ai)
Average volume of Acid used
VA = (VA1 + VA2 + VA3)cm3/3
VA = (15.60+15.40+15.50)/3
VA = 46.50/3
VA = 15.50cm3
(1aii)
2HCl(aq)+Na2CO3(aq)-->2NaCl
(aq)+H2O(l)+CO2(g)
(1bi)
CA VA/CB VB =NA/NB
0.1moldm^-3 x 15.50cm3/CB x
25cm3 x 2/1
CB x 25cm3 x 2 = 0.1moldm^-3 x
15.50cm3 x 1
CB x 50 = 1.55
CB = 1.55/50 = 0.031moldm^-3
(1bii)
25cm^3---->0.031mole
1000cm^3---->x
x=1000*0.031/25=31/25
x=1.24moldm^-3
(1biii)
concentration in mold^-3 =Con
glm^3 /molar mass
0.031moldm^-3=x/106
x=0.031*106
x=3.286gldm^3


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