20. In a titration experiment students were provided with two solutions BA 20 and BA 21. ✓ Solution BA 20 is a solution containing 9 80g of sulphuric (VI) acid per litre solution.
✓ Solution BA 21 is a solution of a carbonate X2CO3 containing 13.8g per litre solution
Following the procedure given a student filled the burette with solution BA 20. She then pipetted 25.0 cmn of
solution BA 21 into a conical flask. She titrated BA 21 with BA 20 using methyl orange as the indicator.
The table below shows part of her results.
Trial nun
2nd titration
1st titration
24.7
Final burette reading (cm)
3rd titration
42.3
25.1
0
11.2
Initial burette reading (cm)
Volume of BA 20 used (cm)
24.7
24.6
24.6
(a). Complete the table above.
(2% marks)