Sodium sulfate is an ionic solid which is soluble in water - Edexcel - GCSE Chemistry - Question 2 - 2016 - Paper 1
Question 2
Sodium sulfate is an ionic solid which is soluble in water.
(a) Which row of the table shows the likely properties of sodium sulfate?
Put a cross (X) in the box to ... show full transcript
Worked Solution & Example Answer:Sodium sulfate is an ionic solid which is soluble in water - Edexcel - GCSE Chemistry - Question 2 - 2016 - Paper 1
Step 1
Which row of the table shows the likely properties of sodium sulfate?
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Answer
The row that shows the likely properties of sodium sulfate is:
melting point / °C
conducts electricity when dissolved in water
C
884 yes
Sodium sulfate has a high melting point of 884 °C and, being an ionic compound, it conducts electricity when dissolved in water.
Step 2
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct formula for sodium sulfate is:
B Na<sub>2</sub>(SO<sub>4</sub>)
This indicates that there are two sodium ions associated with one sulfate ion.
Step 3
Which colour in the flame shows the presence of sodium ions?
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Answer
The colour that shows the presence of sodium ions in a flame test is:
D yellow
Sodium ions produce a bright yellow flame when subjected to a flame test.
