Heating of a salt solution is shown in the diagram.
(i)
P
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d
beaker
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salt solution
dish
gentle heat
What substance is given off when salt solution is heated gently? (1)
(ii)
What is the name of the process taking place in the beaker? (1)
(iii)
What will be left in the dish when heating is finished? (1)
(iv)
How can we obtain a salt solution from what is left in the beaker? (1)