An analyst heated a sample of hydrated barium chloride in a crucible to drive off its water of crystallisation. They recorded the total mass of the crucible and its contents at regular intervals.

Table 1: Mass of crucible and contents over time

Time (minutes)	0	2	4	6	8	10	12	14
Mass of crucible and contents (g)	32.45	31.80	31.25	30.80	30.45	30.20	30.05	29.95

Explain why these data do not confirm that the dehydration reaction is complete.

An analyst heated a sample of hydrated barium chloride in a crucible to drive off its water of crystallisation. They recorded the total mass of the crucible and its contents at regular intervals.

Table 1: Mass of crucible and contents over time

Time (minutes)	0	2	4	6	8	10	12	14
Mass of crucible and contents (g)	32.45	31.80	31.25	30.80	30.45	30.20	30.05	29.95

Explain why these data do not confirm that the dehydration reaction is complete.

Calculations involving masses

Question 30

Table 1: Mass of crucible and contents over time

Markscheme

Calculations involving masses

Question 30

Table 1: Mass of crucible and contents over time

Markscheme

Calculations involving masses

Question 30

Table 1: Mass of crucible and contents over time

Calculations involving masses Questions

Calculations involving masses

Question 30

Table 1: Mass of crucible and contents over time

Calculations involving masses Questions